I have recently acquired a 2001 Passat 1.8T Sport. The engine idle speed hunts when the air conditioning is turned on and I have been trying to rectify this following some advice from other members. I took the car for a test drive last night and it seemed improved however this morning it just won't start. Is there an automatic resetting of the immobiliser if the car is not started within a given time period after unlocking or opening the door.