Need help with diagnosing an issue, 06 GT w/ 3.8L and 6spd. Starts and runs strong but then stalls immediately, traction control icon lights up and I get a P0660 intake tuning valve code. I have already installed the new intake tuning valve and checked that is has power and ground which it does but the light still comes back after clearing despite the valve working.
Not sure if it's the immobilizer (I see no lights) or something else. I just had a spare key made to see if it was that and it's not the problem, ECU was also checked. The factory stereo is long gone but the car ran without it two years ago and then sat before I replaced the head gaskets and timing belt, valve job was done and timing belt is lined up correctly. I also tried locking and unlocking the car with the key (Has no fob) and same thing.
Any and all help is greatly appreciated, Thanks