My a3 is very strange sometimes itll have loads of power other times it wont, the turbo does hiss quite a lot but heard that was common with these models?
Anyway, say i have a car full and am going up a hill the turbo will really stuggle and on rare occasions it will cut out all together until i turn off the car completely and start it up again.
Ive tried to see if it makes a difference when the engine is warm but it appears to be random.
Any ideas ? thanks