Question about 2005 GMC Envoy Xl
How many miles are on this vehicle? Is the engine light on? If so, can you have the codes read? RPM fluctuation can be anything (both caused by mechanical or electrical changes or failure/s). Fuel pressure, engine compression, 02 sensors, worn or sticking TAC unit, vacuum leak, poor fuel quality, dirty or defective MAF sensor, clogged air filter, old spark plugs, excessive exhaust back pressure, stretched timing chain, over due oil change, worn or damaged throttle pedal, or worn out spark plugs. These can all cause your symptoms. Let me know if you have anymore questions.
Posted on Feb 28, 2014
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Posted on Jan 02, 2017
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