Hi folks, Last week my 2001 s3 had the radiator return connector replaced, after 11 years, the plastic went brittle and snapped. The low coolant alarm went off, luckly there were no overheating issues, teh temp stayed normal-90C. Since the connector replaced, every cold start, I need press the clutch in otherwise the engine will stall. The first 100m, the throttle tends to jump and some kind of blockage in exhaust. But after(100m) that, the car behaves normal, even I shut down and restart the car. My question is what is wrong now/?? is the jumping caused by air in the water??? or faulty sensor??which one? Anyone have the same issue please share your experince/advice. I just thought its something to do with temperature/?// thanks very much.