Originally Posted by jimpfromwv
I have a friend the works at the local dealership and he flashed my spare ECM with the stock tune and I can't believe how much better my car runs. No more rough idle, much better throttle response, no more HERKY JERKYS, and this thing runs a hell of a lot better than it ever did with the factory ECU. There has to be an updated flash that no one is talking about.
How did you get a spare ECM and how much did it cost? Can GM detect that you change the ECM?