In cold conditions, i have found, and most others that the idle quality is as you described.. also on first start up and until its warm the air pump comes on and creates a "vibration"..
In the cold it is best to let the car warm up a moment before going out.
When i am late and start up and go, it takes about 2 or 3 lights down the road for the idle to settle etc etc..
I bet it doesnt happen once warm... i.e. go for a 10 minut drive then turn the car off... wait 5 minutes like going into dunkin donuts or something then restart and go... youll see a much better idle quality.
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X1, R58 JCW, M2 in my future if planets align
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