I've got a 2007 2.0tfsi FWD TT, engine code BWA. Bought it 6 days ago, its got an annoying tapping noise from the engine, also when sat on idle, it's very lumpy, but revs don't move. Been told the tapping could be the cam chain tensioner, that the tapping will be worse when oil is warm, and that it will only be lumpy when warm, which are the symptoms of my car but the garage said there are no problems what so ever. The issue with it being lumpy is getting worse each day. Highly annoying, but anyone got any clues to what it could be? Thanks !