The car has turned off while going about 30 mph and occasionally acts as if it is running out of gas (the rpms drop then rev back up again) when traveling at higher speeds even though it has plenty of fuel. While going downhill at steep inclines, the check engine light comes on, but then goes off when I press the gas. These problems seem to only occur when I'm not pressing on the gas or have just let go of the pedal.
Sounds like fuel delivery problem, have pep boys tell you what codes are if you dont have diag tool. if its fuel pump, easy fix, under car, not in tank
SOURCE: engine drops speed when I press gas pedal
Ignition distributor caused problem. Rotor element needs replacement.
SOURCE: Engine runs rough after about ten minutes /idles really low
Just trowing some suggestions out there, but, I would check the idle air control valve (solenoid) or the throttle position sensor. If they check out then my last guess would be the map sensor or the vaccuum to the map sensor. Hope I was able to help. Best wishes.
SOURCE: Nissan Pathfinder (1994) keeps stalling.
try cleaning the throttle plates that can cause this
SOURCE: 1990 300z 5speed BAD vibration from drive train as
check the fuse for your ecu in the engine bay. Replace it and see if that works. See if you weld on a car without disconnecting the battery you send a current to your ecu that could fry it. Nissan thought this one out and put a fuse in front of it. LOL! but all cars have it too.
SOURCE: check engine lightp0170 fuel trim bank one check
I'm guessing your mixture is too lean and it's possibly running a bit rough and there isn't enough fuel getting to the engine. A rich mixture is too much fuel, but that error is usually related to O2 sensors. It might be the O2, but 'trim malfunction,' you're looking at a vacuum leak. Check the oil separator valve then the throttle body gasket and then the intakes. Most likely a vacuum leak and the throttle body, oil separator and intake are the most likely. Run your hand around the bottom of the throttle body and oil separator, if it's greasy/oily there, there's a leak.
If there is no leak, test the MAF sensors...they might need cleaning, and in a worst case scenario, might need replacing.
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