It has been very cold this week....lows in the teens, low single digit temps with windchill....highs in the low 20s at best...car has been taking it like a champ...but tonight, I start it up, let it idle a bit, and all the sudden, it starts to caugh a little out the exhuast. As I drove home, just crusing along, it seemed fine, seemed normal. Any time I would give it any gas, it would develop sort of a missfire, almost felt like fuel starvation, almost felt like tranny/tc shudder/slip. put it in park and revved to 3K (motor was at full operating temp through all of this) and it revved smooth without any problems. Ever see a 4R70W act up under very cold weather? The miss was comparable to the way it ran when the 02 sensors where bad. Probably just the extreme cold.