GMC Envoy Start Stall Idle Problems

3 messages, Last post on Dec 07, 2009 at 2:50 PM

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What is this discussion about? GMC Envoy, Engine

#1 of 3 2002 Envoy idles roughly until warm by alabamamaddog Sep 19, 2008 (4:33 pm)
Starting about a year ago, my 2002 Envoy began to idle very roughly when in drive. Once the engine warms up to the normal operating temperature, the rough idle stops. It idles smoothly when in park or neutral, even when it is first started. I have used Seafoam and STP fuel injector cleaners, with no noticeable results. Any suggestions?
#3 of 3 Idle jumps up and down when heat is on by goodfella69 Dec 07, 2009 (2:50 pm)
My 2004 Envoy idles fine until I put the heat on. After that it jumps up and down until I turn the heat off or it stalls . Any suggestions???