Idle speed adjustment

2003 Yukon XL Denali. Picked this truck up used a couple weeks ago, and the idle speed seems to be a little low, around 500. Makes low speed handling tough, and surges some. Is there an easy way to make a minor adjustment to the idle speed?

On a related note, this seemed to get worse after my dealer had the truck to replace the washer pump. Is there anything near the pump they may have knocked loose or disconnected that might cause this?

Thanks!

Welcome to AF, no adjustment here, the pcm controls the speed, it is possible the iac is dirty or inop or the throttle body is carboned up, addt'l diagnosis will be needed here.

There is no adjustment. The Yukons idle low by design at around 500RPM. There was a service bulletin issued to upgrade the software to address very low idle. If yours also starts a bit hard along with the low idle, suspect the fuel pressure regulator. Good Luck.