How can you adjust the idle on a 2005 GMC Sierra?

Answer 1

you can not it is controled by the computer if you are having problems with it idle low or stalling on you at the traffic light with the ac on or idle funny what you can try is cleaning the throttle body to do this get your self a can of brake cleaner and some cotton rags. take the air breather off the throttle body and spray brake cleaner on the rag and find a screw driver or something to help you hold that goldish flap called a butterfly open and wipe the black residue off and you can spray some brake cleaner in there but not a whole bunch and clean it up the best you can and that will help it idle better. don't worry if your truck is harder to start the first time you fire it up after you clean it that is normal. if that dose not fix it do a tune up on it and if you do? do not buy any spark plug other that ac delco that is what gm puts in if you put a diffrent brand in there you are asking for trouble and if you do it your self just tell the person looking up the parts for you that you want what the factory calls for. hope this helps

== == Probably computer controlled and not adjustable Probably computer controlled and not adjustable