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I have similar symptoms.
Mine hunts/surges at idle only when temperatures fall below 8degC, after 10 minutes driving and for a periods of 5 minutes max. Then she's completely fine. I'm looking into it and first thought it was a little unmetered air, but alas the Lambda output shows no air leak at all.
Mine also very occasionally makes incorrect gear changes. The car tries to shift down from 3rd to 1st when you drop the gear shift into 2nd and it really shouldn't as the speed definitely says 2nd gear to me - ou get this horrible thrust forward and then change into 2nd.
I don't think these are connected but an interesting point.
Lea
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