After looking through forums for similar stories the car is just back after 3 days with an audi tech,intermittent fault showing on vcds intake manifold flap motor,it was stripped down/checked and recommended that the intake manifold be replaced,this comes as one unit with flap motor included,cost more than I was expecting but what a difference !! idles perfect and pulls like a train through all gears.in the time I've had the car it's never driven better,happy days 
