My A3 3.2 is going down hill fast now. On start up it will, 1 in 5 mornings tick over on 3 or 4 cylinders, revs will bounce between 0 and 500 rpm. the only way to stop this is to switch off and re start. Now its started doing it between 0 and 3 miles down the road. You just have to pull over, switch off and re start. It is showing no fault codes. Audi say no fault codes, no problem ( a polite way of saying P** off) and i cant afford to pay them £150 an hour to search for a fault they don't believe exists anyway. I take it in, they give it back with a note saying " no fault found" Once warm it will run all day and not miss a beat. any thoughts ??