GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hello sorry you are still having a problem.
Does it idle slow or act like it wasn't to stall?
If so disconnect both battery cables and touch them together.
This will reset the idle.
Let me know if this helps
I need to do some research.
I'm out to lunch with my wife.
I will get back with you tonight.
Any time you disconnect the battery on this model you need to reset the system.
Like I said earlier.
I would also check all your battery connections for the lights and locks. At battery and fuse block also grounds on the engine and frame
I have seen the body control module act up with bad battery connection.