Ok, update time. the after i changed the MAF it started doing it again, so i got the bad boy up on the ramp and changed the Lamdba sensor (knew that was on the way out anyway as had a previous code for it) but the was still no difference. Took it to a vag specialist yesterday and left it with them. Later that day they called back and despite taking it for a good drive round and vagcom ing it they could re-create the fault or find anything wrong with it. So i went to pick it up this morning, drove it home and it started doing it again, stopped for petrol as it was nearly empty, started it up ag