1989 Chevy 1500 305

Asked by Allroad_360 Dec 12, 2016 at 08:08 PM about the 1989 Chevrolet C/K 1500 Silverado RWD

Question type: Maintenance & Repair

Truck idles fine but at about 1/4 throttle
has a mis starts cutting out just rebuilt
throttle body have checked every thing
from MAP IAC EGR and EGR solinoid
changed 02 sensor and temp sensor
changed fuel filter only thing I have not
checked is fuel pressure ?? It will sit and
idle perfectly no mis is there anything else
that could be causing this issue ??

1 Answer
220,925

Rowefast answered 7 years ago

Possible causes - Faulty spark plug (s) - Faulty ignition coil (s) - Clogged or faulty fuel injector (s) - Intake air leak - Fuel injectors harness is open or shorted - Fuel Injectors circuit poor electrical connection - Ignition coils harness is open or shorted - Ignition coils circuit poor electrical connection - Insufficient cylinders compression - Incorrect fuel pressure.

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