Hi everybody i've just recently bought a 2000 a3 1.8t sport and I have a strange problem with it. When I accelerate its ok but if I ease off the pedal, even just slightly, the car seems to stall for a second and then carries on going. Apart from that the car is fine to drive. It ticks over at around 2000rpm on a cold day till It's warmed up then its fine. I also have oil inside the pipes leading from the diverter valve. I haven't had it checked with vag com yet so don't know any fault codes etc yet. Anybody got any ideas where I should start with this. Thanks in advance any help is appreciated. Sorry to sound so dumb but the last car I had as a project had plugs and points etc