I replaced the throttle body, IAC, coil packs, spark plugs, fuel filter still doing the same thing. dies at idle around 500-600 rpms. also a ticking sound from the motor and it squeals shifting from first to second if I have it pinned not sure if its related or not though. sometimes i can drive it and it wont do it at all and runs somewhat good but then other days it will do it. no codes or warning lights. after it dies it usually starts right back up. also when I roll up the window it feels like it wants to shut off, again not sure if its related.
What makes this problem better or worse?
seems like its random, sometimes it does it sometimes it doesn't. I can go a week and it wont do it. then the next week it seems to do it more often. seems very random
How long has your 2002 GMC Envoy had this problem?
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Hi this is Dusty, I'm one of the auto experts on RepairPal's Car Genius team!
Hey there! Sounds like you've been dealing with a real puzzle with your Envoy.
It's great you've already swapped out some parts, but it's frustrating when the issue persists.
That ticking sound and the squealing during shifting might be clues.
It could be worth checking things like the belt tensioner (and pulleys while you're there), as they could cause those noises and affect engine performance.
If the tensioner is compromised and is failing to apply the correct amount of pressure to the belt this could be allowing the belt to slip (which could be the squeal you've observed, and I've seen them create ticking sounds as well), and in turn preventing the alternator from generating sufficient power to all of the vehicle's electrical systems.
The stalling may be related as well but could also be a failing or weak fuel pump given the intermittent nature.
If you haven't already check for any DTCs that may be stored, this may point to a good starting point.
There's a lot going on here, and a diagnosis by a competent professional will go a long way in pinpointing and ultimately resolving the issue, even if you prefer to DIY most of the repairs.
Hopefully, you'll find the culprit soon and get your ride running smooth again!
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