Hi guys, So I was sitting at traffic lights and noticed slight rough idle in my a3 170 TDI (57 plate). Had occasionally experienced this before and thought I would rev my engine to see if it would resolve matters. However it wouldn't rev beyond 3000 rpm. Does this mean my car is in limp mode? I have VCDS and scanned the car and there are no fault codes stored for the engine nor do I see any warning lights on my dash. Any help as to what this could be and what I should do to rectify it? Many thanks for your help!