Please Help? At this point I don't know what to do.

Asked by Tim Sep 25, 2023 at 12:34 PM about the 1996 Chevrolet Suburban K1500 4WD

Question type: Maintenance & Repair

I have a 96 suburban with the 5.7 vortec. Been
misfiring for about 7 months. In the time I've been
throwing money at it left and right. Replaced the fuel
injector, fuel pump, fuel filter, spark plugs (yes they're
gapped), coils, throttle position sensor, all 4 02
sensors, upper intake manifold and all upper gaskets
and o rings. Truck starts but high revs to 3,000rmps
and then shuts off unless I continuously give it gas.

1 Answer
157,615

James answered about a year ago

Vacuum leak. When the engine revvs like that it's a vacuum leak or a bad IAC. Is your check engine light or service engine soon light on? If so scan the computer for trouble codes and go from there. For the misfire, do a compression test. You could have a burned valve or bad rings. A compression test will tell you. Hope that helps! Jim

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