A3 2.0 FSI 53 Misfire.

Hi - Any ideas on what might be causing my misfire?
I've been back to the dealership four times now and I'm still experiencing an intermittent slight misfire.
It occurs mainly when accelerating slowly in higher gears. But never with an engine temp below 80 degrees.
The dealership have changed the coils and cleaned out the fuel chamber (I think thats what they called it?), but there telling me that they can't find any faults.
Considering asking for the 2nd time that the spark plugs be changed.

Any other suggestions would be apprieciated.

JP.

Hi - Local Audi service dept are working on my misfire as of yesterday morning 25th, until Sat morning 27th.

Whilst I was there the Master Tech told me he suspects it's not a misfire but the FSI engine changing from one mode to another (I forget the correct terminology he used).
According to him it's a common source of complaint. Audi have made available software to correct it at the exspense of a slight increase in fuel comsumption.
Thinking about it, it could explain away a couple of symptoms but not all of them. Personally I think there's a problem with the Choke assembly.

Has anyone heard of this before?
And if so, does the software stop the FSI from being an FSI ie; does the engine now only have one mode?

Posting this mainly to pass on info but at least one reply would be nice even if it's just to say hello!
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JP.