Hmm done some analysis and I think this must be a vacuum problem or a MAF problem. It reminds me of a Golf I had, that had a small vacuum problem - funny idle and stalls if the revs fall too fast.
In case the K&N doesn't fit right I'm going to put the original filter back and see if it fixes it. That should remove the possibility of the vacuum problem though I don't have a smoke machine.
Otherwise I guess I have to go and get some MAF cleaning fluid and clean that - possibly I contaminated the MAF when I removed the old filter? Fingers crossed...
John
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