Having problems with your 2003 GMC Envoy ?

Changed spark plugs on 2003 gmc envoy 4.2lno runs bad

Posted / edited by AnonymousUser on : 19-02-2018

Answers :

First of all, did you use AC Delco Iridium plugs part number 41-103? These are the best plugs for this engine.
Second, did you firmly seat the coil pack when reinstalling them on each plug?
If it is running bad, are you getting the Check Engine light coming on? If so, what is the code?
When you changed the plugs, did you disconnect the battery? If you did, the rough running could mean that the throttle body should be cleaned.
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