Hi guys, think Ive asked the question before but this is getting worse....I have a 2010 S3 s-tronic with a bit of an unusual problem. Whilst accelerating low down in the rev range (about 2,000rpm) in 4/5/6 gear, the car tends to 'chug' a couple of times. This is quite violent and can be felt in the seat whilst driving. No rhyme or reason to it being cold/hot, after been pushed hard etc not all the time so it is fairly erratic. However, I have now noticed that the car is doing the same whilst accelerating sharp and around 3k or 4k rpm. I have been back to Audi and believe it or not, the car behaved itself (on 3 separate occasions!) - plugged into the computer and no errors. Gearbox oil checked for level and contamination but no luck. Anybody else having the same issue? My next thought is that the fuel filter needs to be changed.