2004 GMC Envoy "idle down" Questions

...the car will try to stall and then the pressure will go back up. The oil pressure quage is moving around because the engine is slowing down and speeding up. As far as the idle surging goes try

...idle goes up n down/die out when using Defrost Trying troubleshoot of causing of idle goes up n down rpm/ almost die the engine when turn on the defrost/fan during the start up/idle. Sounds like a ...

...down 2002 envoy the idle is not adjustable on this vehicle, it's computer controlled.. sounds like a large vacume leak. open the hood and listen for a loud hissing noise.. check the pcv hose, they ...

...down when i turn my defroster is on it only happens when the defroster is on When you place your controls on defrost it turns your air conditioner on - depending what the heat level is set on the air ...

...down the vehicle cuts off. Doing fine until the battery went dead. 2002 GMC Envoy WHEN EVER YOU DISCONNECT THE BATTERY.THE PCM WILL LOSE IT MEMORY PCM HAS TO RELEARN IDLE POSITION.SOME TIMES DRIVE ...

idle drops right down to a stall when ac turns on. This started after i changed the battery Cleaning of the throttle body is in order, grime build up is preventing throttle plate from closing ...

low idle Idle goes up and down when stopped at the light charging system and battery are good I would try cleaning the Mass Air flow ,no check engine light?

...and shaking. when its idle up with speed can't really tell until its idle down. put new plugs in it still the same thing you probably have a few bad injectors, a common problem on tahoes and ...

...idle and when I turn on my a/c the turck stalls sound slike you may have unplugged or disconnected somethine else or the spark plug you put in is bad or inpropper gap my 2002 GMC Envoy cut off on me ...

down and when i turn on my heater it almost stalls out...i changed the battery becuase i was told that was faulty but it didnt change anything...ive been told it could be my serpintine belt becuae its