I have 2000 gt with the a\t tranny. well.... A few days ago it went stupid and threw the codes for the epc solenoid and the tcc solenoid. Tranny was acting stupid, we got it. ok. Replaced those 2 on top of the shift solenoid and i'm still getting the same codes. It shifts fine now other than surging a couple hundred rpm under a constant throttle. I'm thinking maybe the computer but thats a wild guess. Any thoughts... I've about lost my mind with thing. Any help will be greatly appreciated. dont know if it matters or not but the tranny is completely stock.