It may be as simple as a dirty throttle body. These trucks do not idle well when it gets dirty. The fix is easy and can be avoided by using only Top Tier gasolines of any octane level you prefer.
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Change oil pump 2003 Gmc Envoy
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ac delco spark plugs are type that originally came with 2003 GMC envoy
Bad idle, lack of power. Vehicle may shake or vibrate at idle.
Idle control system, RPM higher than expected.
6x5
Idle - 2003 was released on: USA: 14 September 2003 (Los Angeles, California)
Clean TB. Known for carbon build up.
20 Gallons
7 quarts
Idle Toad was created in 2003.
The cast of Idle - 2003 includes: King Stuart as Walter