My Audi A4 Avent FSI 2.0 03 model is also having the exact same problem as this too.
Had it into Audi twice for diagnosis and they have come back with one fault (Fuel Pressure Regulator - to low) but have said that they cannot tell me exactly what needs fixing but recommend that I change the fuel pump and put a new filter on.
BUT after speaking to someone who works in an Audi scrap yard he said if it was the pump I would have heard a buzzing noise from the back of the car, which I haven't.
I am really glad I have looked through old posts and found a post detailing identical problems to mine.
I am desperate to fix this problem, its just finding out exactly what needs fixing.
John
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