One problem related to car throttle sticking has been reported for the 2003 Audi A4. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Audi A4 based on all problems reported for the 2003 A4.
Under hard acceleration, the throttle on my 2003 Audi A4 became stuck wide open for approximately 15 seconds. In order to stop the car, I needed to turn off the ignition. I was able to reproduce the problem with the car in neutral, and the throttle seems to persistently stick when the engine revs over 5000 rpm. I'm planning on taking this car to an Audi dealer tomorrow to have the problem diagnosed further.