Mitsubishi 2.6 L engine only runs on 2 of 4 cylinders

1. Connect the distributor's B+ (battery) terminal to a switched 12-volt source, such as the ignition switch.

2. Connect the distributor's tach terminal to the tachometer signal wire, if you have a tachometer.

3. Connect the distributor's ground wire to a good engine ground.

4. Connect the distributor's #1 spark plug wire to the #1 spark plug on the engine. The #1 spark plug is usually located on the driver's side front cylinder.

5. Connect the remaining spark plug wires in firing order sequence to the distributor cap terminals. The firing order for a Buick 455 engine is 1-8-4-3-6-5-7-2.

6. Install the distributor cap and rotor.

Have you changed your spark plug wires and distributor cap? You might have a spark jumping from a bad wire or distributor cap. Under acceleration, the amount of air/fuel in the cylinder increases and this may make it harder for a spark to jump across the plug gap. It may be finding a different path, and that is what's causing your engine to run rough. Spray water over your spark plug wires in a dark place and listen to see if your engine runs rough. Look for where the spark is jumping from a wire or distributor cap.

I'm sorry to hear that you're having trouble with your 1989 Mitsubishi Eclipse. Here are a few things that you can check to try to get spark to the spark plugs: Check the spark plug wires: The spark plug wires can become damaged over time, which can prevent spark from reaching the spark plugs. Inspect the spark plug wires for any cracks or breaks. If you find any damage, replace the spark plug wires. Check the spark plugs: The spark plugs can also become fouled or damaged over time, which can prevent spark from reaching the spark plugs. Remove the spark plugs and inspect them for any damage. If you find any damage, replace the spark plugs. Check the ignition coil: The ignition coil is responsible for generating the spark that ignites the fuel in the engine. If the ignition coil is faulty, it can prevent spark from reaching the spark plugs. Inspect the ignition coil for any damage or signs of wear. If you find any damage, replace the ignition coil. Check the distributor cap and rotor: The distributor cap and rotor are responsible for distributing the spark from the ignition coil to the spark plugs. If the distributor cap or rotor is faulty, it can prevent spark from reaching the spark plugs. Inspect the distributor cap and rotor for any damage or signs of wear. If you find any damage, replace the distributor cap and rotor. If you have checked all of these things and you are still not getting spark to the spark plugs, it is possible that there is a problem with the engine's computer. In this case, it is best to take the vehicle to a qualified mechanic for diagnosis and repair. Here are some tips to help prevent these problems from happening in the future: Change your spark plugs and spark plug wires according to the manufacturer's recommendations. Keep your engine clean and well-maintained. Avoid running your vehicle on low fuel. If you notice any problems with your vehicle's performance, have it checked out by a qualified mechanic as soon as possible.

Sounds like your Timing Chain or Belt Are Damaged and Caused your Ignition Timing to Jump out of Time, Also check your Distributor Cap and rotor NOTE: if you have a Distributor ,Some are Distributorless. Pull your Spark Plugs out BEFORE you Do Locate #1 Plug its in Front of your Engine.And Trace the Wire to the Distributor Cap. If you have a 4 Cylinder #1 is in the First Plug in front of vehicle, if its a V-6 #1 Plug is on Left side first plug in Front. Depending on which engine you have will determine if your wires go into the Distributor cap Clockwise or Counter Clockwise. So BEST to Simply Mark them to get them back in same order.You'll need to Get the Enging to crank over and have a Buddy Put a Compression Gauge in #1 Cylinder and Bring it up to TDC (Top Dead Center) thats when the piston is up and gets the Gauge to Move up then your on the Compression Stroke, Then check distributor rotor to see if its pointed to where your #1 Spark Plug wire came off or at least close to it.Just hit the Ignition Switch off and on Until you have it showing compression on Gauge. JUST ON and OFF that Fast. If the Rotor is pointing To a different Spark Plug Wire in the Cap, Sounds like timing Jumped. Hope this will help you solve your problem or at least find it. If you don't have or not sure on How to do this i recommend you have a Qualified Mechanic Shop run the Tests. Thanks and Good Luck

Cylinder #2 is the the second spark plug counting from the right to left.
EX.Below are spark plug on engine
engine
-------------------------------
' (oil cap) '
' (4) (3) (2) (1) '
'_________________'

Your misfire can be cause by couple of things but the cheapest way that you can try to fix your car is to do a tune up by replacing:
1)all spark plugs
2)do a oil change
3)spark plug wires
3)distributor cap and rotor

note misfire can be cause by:
1.bad gas
2.spark plug and/or wire
3.distributor cap and/or rotor
4.valve adjustment
5.injector
6.off timing
7.ECM
8.bad wiring(power, ground or feed line)

Firing order 1-3-7-2-6-5-4-8 --------- front ' 1 2 3 4 ' of ' 'distributorless ignition vehicle ' 5 6 7 8

You may have got the spark plug wires out of sequence.
Reseat the coil wire going to the center of the distributor cap Check the spark plug wires at the distributor against the firing order as follows:
The spark plug firing order is 1 - 4 - 2 - 5 - 3 - 6 The distributor rotor turns CLOCKWISE The engine cylinders / spark plugs are numbered :
firewall 3 - 6 2 - 5 1 - 4 front
Best wishes,
TF

GET A PIECE PAPER DRAW A LARGE CIRCLE TOP UPPER HALF CIRCLE LEFT TO RIGHT WRITE NUMBERS 1 AND 3 BOTTOM HALF CIRCLE LEFT TO RIGHT RIGHT NUMBERS 2 AND 4 THAT YOUR DISTRIBUTOR SPARK PLUGS WIRES LOCATION.STANDING ON SIDE OF ENGINE WHERE DISTRIBUTOR IS LOOKING DOWN AT DISTRIBUTOR 1 AND 3 FIRST TWO SPARK PLUGS TERMINALS NEXT TO ENGINE. AND 2 AND 4 SPARK PLUGS TERMINAL ON CAP FACING YOU. THIS IS CYLINDERS LOCATIONS STANDING IN FRONT OF ENGINE.RUN WIRES FROM DISTRIBUTOR CAP TO PLUGS TO THE ENGINE SPARK PLUGS.

take the spark plug out of the hole on the engine. the very front plug.
have someone bump the engine for you. take the cap off of the distributor, and when your friend bumps the engine watch the way the rotor is turning. i think its counterclock wise. but anyway, hold your finger over the spark plug hole and have the friend bump -bump- bump the key until the air pressure "Pssst" blows your finger out of the hole. thats the compression stroke of your engine. and right now its set to send a spark to that #1 piston.
SO look at the rotor, and pay attention to what direction the rotor is pointed. and when you put your distributor cap back on, your wire for #1 spark plug has to be pointed at the rotors tip, to get spark. so put cap back on, and then put #1 at the rotor tip, and remember what direction the rotor spins ? now put your spark plug wires on the cap to match the "firing order" The firing order is 1-3-4-2 with the cylinder closest to the front of the vehicle being #1 so if the rotor spins backwards . wherever the rotor tip is now ( since you bumped it to the compresson stroke ) on the #1 cylinder, you know where 1 is. now put #3 piston wire on the next plug, on the distributor then 4 , then 2. tighten everything, put the spark plug back in. and start your truck bro.

350 Chevy engine in what? 1990 Corvette? Who built it, did you?

Sounds as though you have plug wires wrong.
Firing order is 1-8-4-3-6-5-7-2

Distributor Ignition System:
Distributor rotates Clockwise. (Rotor)
Find Number 1 tower on distributor cap, go Clockwise with Firing Order.

Distributorless Ignition System:
VIEWING the engine from the Front of the car.

Spark plug wire connections along the back, starting from Left side going to Right side;
2-3-7-4

Spark plug wire connection towards the Front of the engine;
6-1-5-8

(To guess I would say you have 5 and 7 wires switched)

Left side cylinder order is 1-3-5-7, going from front to back.
Drivers side is Left side.
Right side cylinder order is 2-4-6-8, going from front to back.