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2004 gmc envoy_sle_xl
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Discussion Starter · #1 ·
Hi all, I've had this random issue with my '04 XL with the I6 for a while now. Truck is running fine, when I pull up to a stop light. or sitting stopped in traffic, it will start idling rough. Some times it shuts off, sometimes it doesn't. If it doesn't shut off, when I step on the gas to go, is goes into "Reduced power mode" and the check engine light comes on, and have no throttle response. To fix the issue, all I need to do is turn off the truck and restart it and all is fine. Happens at random with no other issues. Only coed is "Unclassified ECM Issue".

Any ideas or help would be great.
 
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