Hi, on my 2009 Audi A4 Avant Auto with tiptronic gearbox I have an issue that feels like clutch slip. It is very slow to move when the trans is first engaged (on a cold morning), and if the car is parked on a hill it exacerbates the issue and hardly moves at all, regardless of how many revs I give it. Any ideas before I take it to a garage and risk being ripped off?