High idle hot

Hello, you really really need a diagnostic test performed using the GM Tech II tool or equivalent. That's the only way you can actually look at throttle position and other data as seen by the engine's processor. Code readers give you bare clues but not much more. You have to do the testing. Clues are just that. They lead to wild guesses. There are multiple reasons you could have this concern, and testing is needed to narrow them down to the actual cause of failure. www.repairpal.com/repair-shops