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From what I've found with my 2002 envoy, apparently there are issues with the fuse panel under the hood. If you remove the 2 covers on the fuse panel, you will see 3 bolts that hold the fuse box to the frame. These bolts also serve as a ground for that panel. Make sure they are all tight and even try loosening them and re-tightening them to make sure they are making good contact with the frame. I had one occasion where my envoy died in a driveway because I checked the fuses for issues and it caused that panel to loose ground. The other issue came about 2 weeks ago while I was on my way home on a 4 hour trip. It cut out unexpectantly while I was driving. I asked my dealership if this was a common problem and he said yes.

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Q: 2002 GMC Envoy engine shuts off while driving?
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