Sounds classic for a bad MAF but you've already replaced yours....you didnt use one of the cheap ebay VW inserts right?

Could also be a boost problem.

Both of the above if bad should give a CEL.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)