I was literally just about to post about something similar with my own MK6 GT TDI 2.0. Some mornings when im taking off, as im coming off the clutch in first gear (only happens in first gear), theres shuddering from the engine, the kinna shuddering you get when its going to konk out, but im giving plenty of revs. If i stop the car then take off again, it will happen again but not as bad as the first time, then as it warms up it goes away. It also does it in reverse. The car has just hit 12k and is a year and 4 months old :/ Is this something to worry about?