02 sierra when sitting at a light or just stopped anywhere the idle is sitting at 500 and if the ac is on the engine will sputter. If i touch the gas and raise the idle to 750-1000 it runs fine and no sputter...so my question is can i/and how do i adjust the idle on this truck??? or if you have had a similar problem help me out, thanks

You need a scanner that will recieve live data to see if the computer is getting a.c. on input. You may need an a.c. pressure switch.

so you dont think it is an idle issue?? where would i get said scanner? would auto zone have one???

Any auto shop schould have one . Call autozone to see if their scanner does live data .

There are several inputs for the computer to raise the idle. When your are stopped and turn the wheel back & forth the computer recieve a signal from a power steering pressure switch to up idle.Same thing with the power demand from the a.c. compressor.

It would also be a good idea to clean the throttle body since a dirty one can affect idle quality.

//2000CAYukon