'98 4.0 questions

Hopefully someone can help me out on here since nobody else seems to be able to. Well during the summer and warm weather months it runs great no problems what so ever, but during the winter it runs like poop until it warms up. This winter it started throwing codes for for the first time where it never did that before. The first code was misfire on 1,3,5 cylinders, and then the second code the next day was just multiple misfires. Once it warms up a bit you can delete the code and it wont do it again until the engine gets cooled back off. Already put new plugs, wires, and coil packs on it twice. So would any of you guys have any clue as to what the heck could be going on with it?? Any help or suggestions would be appreciated. Thanks, Later

did you ever figure out what it was man?

Heck no!! It hasnt been doing it much this week since the weather has warmed back up a bit. Just dont make any sense to me at all. Kinda hoped someone else had ran across this before and could tell me how to stop it. haha