I have a 2004 A4 B6manuelwhich I just purchased not to long ago. Its has and upgraded turbo from ATP, intercooler, upgraded diverter valve, and the ecm has been flashed by stp. My problem started 2 days ago. When I step on it hard the boost gauge when it reaches around 7 pounds of boostthe enginebeginnings to hesitate and the check engine light comes on. And then thecheck engine light flashes. If i let go of the gas and place the tranny in the next gear the check engine light goes back to solid. and the car stops hesitating. Not sure what the light is on for. however i did notice that I"ve been running on the rich side. So i went ahead and disconnected my MAF sensor and the car begins to operate properly however when i let go of the gas and the rpm goes back to around 800-1000 the car turns off. Any one have and advice????

 

i had this with my 2000, it the maf sensor, its bad, when you unplug it it runs normal for a short bit then like if i tried to come to a stop it would shut off, replaced the maf and everything went back to normal

 

Can it be that the element on the maf is contaminated? did u try to clean the element before replacing it?

 

yeh and it worked for like 2 days and went back to the way it was, i just changed it, you can get one at autozone.