Hello James,your engine type uses a throttle body and it is not uncommon for the recirculated engine gases to build up a carbon lip inside the throttle body causing the flap to bounce and cut off the small air gap required for idle.I advise you to remove the litle bugger and giv it a clean out worthy of a hospital surgery and refit and readapt the learnt value/basic setting via vag com and takr it from there.Also pay attention tothe breather pipes as they crack with age and cause unmetered air leaks which also can have the same symptom.Regards A8
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