1991 Chevy Truck Will Not Run Smooth All The Time

SHUTTLEWORTH

MEMBER
1991 CHEVROLET TRUCK
V8
2WD
AUTOMATIC
153,000 MILES

My truck runs well sometimes and sometimes it dosen't. The engine light stays on and if it stays on solid without blinking the truck runs fine. The truck will start and run fine sometimes and other times the truck will start and run terribly. It tries to shut down and the only way to keep it running is to feather the gas pedal until it decides to run smooth and the engine light comes on and stays on solid again. I've replaced the injectors and rebuilt the throttle body and regulator. I've replaced the throttle position sensor, oxygen sensor, vehicle speed sensor, distributor cap, ignition control module, distributor rotor, spark plug, spark plug wires and fuel filter. I've ordered a MAP sensor, ECM and IAC valve and will try that unless you can give me some other advice.

Thank You
Wayne A. Shuttleworth

2 Replies

JEEPFAN

MECHANIC
135 POSTS

Take it to an autozone and have them scan the computer they do it for free
tell me what codes they get

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Thursday, November 12th, 2009 AT 10:29 PM

SHUTTLEWORTH

MEMBER
2 POSTS

Thank you for your quick response, I have already had the system scanned by computer and the computer would not read the system. It keeps coming up with a check connection fault when there is no connection problem. I even got on the web and found how the system can be tested by jumping pins A and B and reading the engine light flashes to determine the fault code but that wouldn't work either.