Your car needs to relearn the idle, since the battery was disconnected, Do a search in the forums. If you can't find it I'm pretty sure the process is to get in the car with it in park- do a cold start, and let the car sit and idle til it gets to regular temperature. Then cut the AC on and let it idle for another 15 min, then cut AC off and drive for about an hour.
That's close anyway- but search "relearning idle" I'm pretty sure that's your problem
Chris Rose at AM knows everything there is to know about this, so you could always PM him too.
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