At the beggining of December I installed a new pc680, since then my car won't idle when under any electrical load (heater on). I noticed that my cel never popped back on, it was always on for catalyst low efficiency. Starting to get real aggravating. Anyone else have this problem? Its like the ecu never completed a drive cycle after battery swap.

 

Could be an issue with the alternator. is a good video on diagnosing alternator/electrical problems.