Why does the engine idle high for two minutes at startup?
This is normal. All vehicles idle high at start up to get the engine to operating temperature. This is known as open loop. The computer ignores signals from O2 sensors to keep your engine running safely. Once it has warmed up, it will enter closed loop, and you will see a decrease in idle.
SOURCE: replace starter on 2002 GMC Envoy SLT
check to see if the starter itself is getting a signal to crank. youll need to use a test light and have someone else try to start the vehicle, while you probe the wire to the starter to see if it is getting power. if not, check the starter fuse to make sure its not blown, as well as the starter relay to make sure that is good too (very common on gm's for bad relays) if the fuse and relay are good, but your not getting signal, it is an ignition switch problem.
SOURCE: 2004 GMC Envoy Idling high
sounds like the throttle plate is stuck try cleaning is out do not push on the throttle plate will damage it. have some one sit in the vehicle with their foot on the pedal take a tooth brush and some carb cleaner clean both side of the plate and inside the housing the best you can and see if the stops it.
SOURCE: 2005 GMC Envoy XL High Speed Blower not working
if the other speeds work it is probably the blower resistor; if applies varying resistance to the voltage running the blower; this allows the fan to run at different speeds; should be located very close to the blower motor; behind a panel under the passenger side of the dash
SOURCE: 2002 GMC envoy slt 4.2
Sounds like you may have disconnected the battery. Does the rough idle only happen when the defroster or A/C is on? If so clean your throttle body with throttle body cleaner with the battery disconnected. When finished, drive it for 5 or so miles with the defroster / AC off to let the computer relearn the settings. This will solve your problem.
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