this is a common problem following dead batteries. i don't know why, but it seems that unless all the electronics have whatever full voltage they're expecting, then the idle is out of whack. some people report that it straightens out after installing a new battery, others never report back in.
i see you're up in the cold. try letting your battery charge up, maybe put it on a charger. maybe even reset the pcm again after the battery is recharged.
typically, when the pcm is reset, it reverts to default settings, and those are fine. i reset my pcm all the time, without a problem. but - my battery is good, so that might have something to do with it.