Ever since the head was reinstalled on my mkiv, the car has run like total shit. I've checked the timing, checked the coils, adjusted the TPS so it is working correctly, and it still stutters really bad. Right when i step on the gas, the engine revs up about 500 rpms, and stops, like the plugs completely stopped firing. The EGT's drop, the rev's drop until about 1000 rpms where they pick up again and it starts reving fine, until i let off the gas. Then it does the same thing all over again. I've tried just about everything short of dismantling the entire motor to try and figure out what the hell is going on. Anyone have a clue? BTW, my car is a single turbo, fuel system, VPC, 6-spd... please let me know if you have any ideas of what to look at.