Had this exact problem a few weeks back, with exactly the same symptoms that you are describing; then the problem became more frequent.
Turned out that I needed a new throttle pedal; changed it and the car has been perfect ever since. Look into it mate. Me and my mate took the pcb out of the...
Technically they're illegal if you don't fit headlamp washers and an auto-levelling system. Most MOT testers will just assume they're factory fitted HIDs and as long as the beam pattern is ok then they'll probably pass your car.
If you get stopped by the local constabulary and they book you...
Had a go at changing mine and thank god the screws came out without too much fuss; I refitted them with LED festoons, HPI R/C screws and a dab of copper grease.
The pics are crap, but you get the idea..........
My name's Martin and I've just bought a phantom black metallic A4 1.9Tdi 130 (6) Sport Saloon.
Only had it a day and a half and I'm loving it already. :thumbsup:
Nice forum you have here, just thought I'd say hi.