The missus' A3 2.0 TDI (my old one) has devloped a lumpy idle. When the car is sitting at idle it feels like it is alternating between 3 & 4 cylinders continuosly. It has been doing this for a while and she is also complaing of it not having enough 'pull' while she drives it. I don't remember it being like that when I last drove it regularly which was about a year ago. She drives it on a 20 mile round trip to work through london traffic but gives it a blast every now and then. She did also complain that it blew a load of black smoke out one day when having a little blast around the north circ. Anyone have any ideas? I'm thinking throw some injector cleaner into it and see what happens.