97 jeep wrangler starts then stops right away, I can give it gas and get the rpms up then it just stops. I have already replaced the spark plugs, fuel injectors the wires and the rotor cap and rotor. Even the crankcase senser.

which engine the 3.6? v6?
that shudder is called MISFIRE.
get a tune up yet, even $1.49 spark plugs?
no its not the trans,
if it dont slip, its not trans, (see RPM races? that is slip or too low gear)
if it shifting to the right gears, its not the trans can you count them?
is the CEL lamp glowing or flashing driving, is yes, that means
scan me now. in fact scanning while it shudders, is like (magic)
why start guessing, do a tuneup,
then scan it.
if its is misfire the PCM will tell you what cylinder misfires.

are your spark plugs 6 years old, if yes, why?
going for 200k miles on them.?

I have a 4cyl 97 jeep wrangler. My fuel economy went from 75-80 miles per 1/4 tank to 55-60 miles per 1/4 tank of gas. I traced this to a bad coolant temp sensor (replace twice), and fouled O2 sensors believed caused by my self by placing too much oil on spector air filter (now wipe off excess and let dry in sun), and using carb cleaner and or gas treatment (stopped using). fuel economy went back up to 75-85 miles per 1/4 tank. (also disruption of sensor input/output signals didn't help from battery sliding into computer wiring harness, which I cured by placing a 1" spacer on rear clamp to keep battery away from computer.)

related problem with disrupted sensor input/output caused by battery sliding into computer wiring harness. cured by placing 1" spacer on rear clamp pushing battery away from wiring harness and computer.

Try adjusting distributor to 5 degrees after TDC.

Sounds like a vacuum leak.

you are saying it is getting spark, and fuel, right? If it is getting spark, and fuel in to the throttle body, check compression-make sure the Mass Air Flow sensor is plugged in, and double check your spark-you say you replaced all those ignition items, but do not say that you have spark.

Replace each wire individually from plug to distributor one at a time and they will be in the right order. Or make yourself a diagram before you start, very carefully marking the first one you take off the distributor and where it came from and where it goes. Hope this helps..

check your firing order for your plug wires

how long has this been happing..one tank of fuel or more, could have been bad gas, replace filter,, put gas dryier in fuel tank..if it continues could possibly be transmission related..the reving down doesn't sound like transmission though if tansmission was slipping it would rev up..good luck

Try your camshaft possition sensor. If it is the same as my problem I just had to replace that and it started right up. Oh and mine was built into the distributer assembly. Take off cap and pin it's the plastic thing at the bottom. Should just pop out and you have to go to the dealer to get the part. Hopefully this helps!