Auidi A3 2ltr TDI Sport ENGINE JUDDER

Bought a new A3 2 ltr TDI Sport five months ago and now got 7000 miles on clock....From about 3000 miles I have experienced a 'judder' on the engine when the vehicle is coming to a halt, as if the engine management system can't manage to lower the revs smoothly from running speed to idle, it only lasts for about five seconds.

THIS ONLY HAPPENS WHEN THE ENGINE IS IN THE WARM UP PHASE FROM ABOUT 60c TO NORMAL OPERATING TEMPERATURE.

Iv'e taken it back under warranty and they have lowered the revs on the 'tick over' which has helped ever so slightly.

I have previously had Mk 4 Golf GT TDI's and the early models had the same problem, although I thought this had been fixed. When I mentioned this to the technician at Audi he didn't know anything about it.....CAN ANYONE HELP PLEASE???????????