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check engine light is on, has been since the first time the idle caused the car to stall (3+ years ago). Tech said piston misfire- but that it was probably something else. Fluctuation went away, so I just let it be...
Seems to fluctuate a bit when there is an electrical load applied (ie. brakes, headlights), but the real low idle that can cause a stall will go away for months at a time.