it would figure. cold starts id get surging until warm.. convienced it was arching inside the maf connection. displace the air with dielectric grease and issue gone.Depends how you define quirk, strange that it only seems to cause problems in prolonged cold spells - we've had cold snaps before and it hasn't done it until now. I actually wonder whether some dielectic grease on the prong ends that go into the plug would be a better idea - it might be a loose contact / poor conductivity that causes it.
If it was just dirty prongs / limescaled then it should fail irrespective of the temperature outside. Maybe it's a thing with VW coolant that it looses the ability to conduct between the prongs during very cold weather?
In fact the more i think about it the more i'm convinced it's the contact between the prongs and the plug - you effectively scrape that when you pull it off to check it which would make scraping the prongs a red herring?
cold making things contract and letting cold moist air around contacts?