OK I'll try and be more helpfull, though take the hint of a cahnge of car that it was un-fixable.
Audi basically turned around and said it would cost too much money (not cost effective) for me to let them inspect & replace parts of the car that could cause the erratic idle. They put it down to the 1.6 AKL engine, they didnt come out right and say it was a design flaw but they may as well have done.
I replaced numerous parts of the engine, had numerous services, adjustments, cleans to here and there of this that and more ($$$).
I was also going to take my car to AMD as they sounded really keen to investigate. It may be worth to give them a call. In the end I sold her on. Too much anoyance to have an Audi that sounded like a tractor on unstable rocket fuel.
Quote from email...
"I have checked with Audi today with ref to the idle kick back fault and erratic idle, as per usual they have no record of this being a known fault. I am sure it will become evident once under investigation."
If the issue is that bad then I suggest you take your car to Audi or AMD and get them to clean the MAF and any other sensors, make sure there are no air leaks in the air intakes etc... It sorts the car out a treat BUT the rough erratic idle will still come back after a couple of hundred miles.
Cheers