p0300 misfire

This started in the middle of a snow storm and someone is insisting a sensor is plugged up and once Temps come back out of the teens it will melt out and be fine. Just curious on the validity of that... I have searched youtube and threads for days and I can't seem to find one that is having the...

2010 Traverse 180,000 miles. Runs well over all. This winter it started doing a P0300 misfire under these conditions: 1. Vehicle is started and run only ~30 seconds total time to move it to a new position on driveway. 2. Vehicle sits there w/o being started again overnight 3. The next am when...