My friends 12 CVO has a strange problem. When it gets hot the throttle goes limp. He replaced the TBW and the connector going to the throttle body. He also swapped out ECM's to see if that was the problem. Anybody know what could cause this? It will be running fine and then all of a sudden it slows down and won't go past idle. Charging system seems fine. Stock stage 1 110" motor.