Intermittent misfire while driving

2002 GMC ENVOY
125,000 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
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[email protected]
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At stops it wants to stall. Misses bad on and off while driving. I changed cam sensor, crank sensor, new plugs, cleaned throttle body. Still runs the same.
Dec 11, 2020 at 2:58 PM
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ASEMASTER6371
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Good evening,

Did you change the boots on the coil when you replaced the plugs? They are very common for failing.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

I would also do a compression test to be sure the internals are good in the engine.

https://www.2carpros.com/articles/how-to-test-engine-compression

What are the codes that are set?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Roy
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May 17, 2021 at 5:35 PM
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[email protected]
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Showing no codes.
May 17, 2021 at 5:35 PM
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ASEMASTER6371
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Okay, I would do the other checks I suggested.

Roy
May 17, 2021 at 5:35 PM