I initially suspected the fuel pump, and still do. So thanks for suggesting I check it. I'm going to drive the car a few more days (unless the snow flies first) and will check the fuel pump at that time....unless it's just the Seafoam and/or bad gas, which I'll know more about when I refill the tank. I'm still hoping, but not expecting, that maybe the problem will end with this tank of gas. But definitely not holding my breath.