yeah I know what its like... But to be honest, unless there is something crtitcally wrong (unlikely, since the audi engines are pretty much bulletproof), then the only things that can cause idling issues like this are the ones mentioned before.
This problem can be caused sometimes by the lambda sensor, but this will show up on the MOT, so I wouldn't do anything about it just yet.
Try this... get the car nice and warm, go about 25mph in second gear, then floor it all the way up to redlinne. If you get any flat spots in acceleration then the problem has to be either MAF or split pipe.
If you dont have any flat spots, then it is only an idling issue, and the throttle body is 99% likely to blame.
If you have the VAG COM, then you can measure MAF and lambda, so that should remove some uncertainties.
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Miko84
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