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p0300 and rough idle and bad compression
Posted to Technical Discussion Forum on 9/27/2011 5 Replies

This suv comes in with a rough idle complaint and a P0300 code in history. Watching misfire data I see it sometimes missing on $3. I read on alldata where they had some defective plugs but I checked and it doesn't apply to this vehicle. I also ran a search... Login to read more.

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car Vehicle Data

2004 GMC Envoy SLE 4.2L

Engine4.2 L
Trans4-speed Automatic (Electronic)

car Vehicle Data

2004 GMC Envoy SLE 4.2L

Engine4.2 L
Trans4-speed Automatic (Electronic)