Audikillsbmw, you were quite right about the MAF sensor, I took the car to an VW Audi specialist, the checked the vacuum pipes no problems. Turned out to the be MAF sensor - they swapped that with the new part and now the car seem to run perfectly. The garage said there were no more fault codes - (I havent check on VAGcom yet).

Kaynos - Make sure that you get your MAF from Audi dealer only - my specialist replaced it initally with a bosch part and it didnt fix the problem.

Thanks for everyone helping. :-)