Hi folks, I'm new to the Audi forum looking for some tech help i have a a3 1.8t sport 2001 x-reg when idling it seems to be a bit erratic idle speed is at 800rpm then drops to about 600rpm and seems to idle up and down between these rpms. I can also feel it doing this while driving at low revs. Otherwise the car is driving fine I've just serviced it changed all 4 coil packs and replaced the timing belt. Although I did buy the car with this idle problem. Any thoughts or advice welcome. Thanks in advance.