Hi there, i have just purchased a 2007 a6 2.0 tdi. I have replaced the throttle body with a new one as it was bad. I have strange behavior with revs when i am slowing down and the revs get down to about the 1200rpm mark. The car kind of surges or hunts till i come to a stop. Any ideas? Also the car idles at about 900rpm is that a bit high? Thanks in advance.