ok, a little more time to tell here. it started dropping voltage with the old alternator. it was ok at 1000 rpm but drops to 11.5 volts in gear at idle. changed out 2 new alternators, and the pulleys to attempt to bring the voltage up. with the new one, it charges at 13.5-14, then as it sits in gear it slowly drops to 12.5 then eventually to about 11.5. tested battery and load everything is good and replaced the battery last august. and it is fine as well. my local mechanic says it may need a pcm reflash, what the general consensus here.