I know this is an old thread, but in case it is the only one covering this problem, I decided to post my resolution.
After enough investigation, I figured out the problem! There is an air leak created between the throttle body and the main seal when it gets cold enough and the parts contract (I was parking on the street in Chicago winters, had the problem when below 20F degrees and windy). I replaced the throttle body seal with a new one and haven't had the problem since. It has been 3 winters with the new seal and not once has it happened. Hope this helps anybody out there with this problem. The seal is inexpensive, PN 12580919 / 405036 at Rock Auto: More Information for ACDELCO 405036