Rising and falling rev counter needle on idle
Had my S3 for a few months now and since I bought the car the rev counter needle rises and falls by about 50rpm while idling.
I have had Audi look at it and they diagnosed the induction system needed cleaning. I had it cleaned and it seemed to make a little difference at first but now is the same as it was. There is a new air filter fitted aswell.
Without keep going back to Audi to charged a fortune to fix nothing. Is there anyone out there that can help diagnose what the issue might be?