The throttle body essentially regulates airflow to the engine. When it fails, you would encounter all sorts of drivability problems like engine stalling, misfiring, rough idling, and poor performance. So, if you are noticing signs of throttle body failure in your Audi A3, call a qualified automotive technician right away.
https://www.youtube.com/watch?v=lMph4RbQxn8
How To Diagnose Audi A3 Throttle Body Problems
