my 2002 a4 threw a p2101 code, throttle body actuator. car will hardly run, epc light is on and check engine light on. i swapped out the old throttle body with another one that is good just to see if thats it. car still wont hardly run. whats the next step. all i have to work with a is the mac mentor scanner right now. could it possible be an ecu issue. anyone had this same issue. thanks for any info.