I would like to know if stop light switch as any connection with torc converter solenoid
the truck idle very good but when warm put it on gear it stall must of time on rivers stall very rarely on drive?
You will need a scan tool that will do live data, that way you can see if the ECM is getting the signals it needs for idle compensation while in any gear or auxiliary loads ie A/C, PS. Have you checked the throttle body? Make it is clean and the plate is closed all the way during idle.
Search GMC Sierra 1500 Questions
GMC Sierra 1500 Experts