What is your question?
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What is your question?
The check engine light is on. It idles rough and when you hit the brake, the RPM's fluctuate and it runs rough but when driving above 45 it's fine.
What makes this problem better or worse?
Idleing or braking
How long has your 2008 GMC Envoy had this problem?
Just since yesterday
1 Reply
Hello, first -- you have the luxury of available clues as noted by the "check engine light" being on. Obtain a diagnostic tool (or enlist the help of a trusted technician) and determine what failure codes are stored in the engine's processor. Whereas they may or may not relate to the concern you are experiencing, it's a great place to start, in that they represent "known" issues and those should be addressed before guessing further. If I had to guess, I'd say you likely have lean codes in the processor and that you have an air intake or vacuum leak.