I have a 2005 GTO that was originally a manual car. We converted it to automatic and are almost done installing a complete wire harness from a donor A4 car. We have a tcm42 that I bought from a vendor that has been programmed for the car.
I need to reflash the ecm to an A4. I have access to another locals 06 that is automatic.
How do I do this? My car has a custom tune file. Do I rewite entire with his tune file? Then install my tune files? Or?
Somebody mentioned segment swap. Way over my head. Help, PLEASE!