Question about 2005 GMC Envoy

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While driving my truck tends to miss and engine light comes on for a few days to a week and then goes off.

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First thing is to get the codes, the computor will guide you in the right direction, but those are known for bad coils, did you wash the engine ? also need to know the engine size, I am guessing it's a 4.2

Posted on Dec 30, 2010

  • feetbqic Aug 24, 2011

    Our 05 Envoy 4200 has developed a intermittent miss. At first, it appeared under a load after about 60 miles of travel. Just this week, it began after just a few miles. It is bad around 60 mph. Heavy acceleration clears it up temp. but it comes back. (No fuel starvation). RPM's drop from 1800 to 1400, then return almost immediately. This happens now on a more regular basis. I'm thnking maybe heat related, but don't know where to begin my search. No codes thrown by the OBD.



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