i have a 2002 a4 quattro 1.8t. the car will barely start and run. keeps throwing a p2101 code. i dont have a vag-com, but my mac mentor scanner pulls the code and clears them ok. thing about it is, i replaced the throttle body with a another one, done a tb alignment, still is saying p2101 throttle body actuator. could it possibly be a bad ecu. the epc and cel is on. when i get the thing runnig,it is misfireing, and it throws a p0300, po638, and the p2101. but i clear the codes after i shut it off. turn the ignition on(not start the engine) and the p2101 comes right back on. any ideas?? thanks for any info guys.......