Sak

Hi all Im a long term Audi owner, recently purchased an Audi Q5 2.0 tdi auto, 2010 Its done 120,000 and I dont have much of the past history. So the issue: when coming to a stop, the car jerks few times. On a few occasions the cars stalled. There is a mild judder on take off but after that car drives superb. I've done a full service inc gearbox oil and filter Diagnostics haven't picked up anything either. Any suggestions. Cant really afford a big bill to repair