UPDATE: This morning, it again started right up and continued running. I took it for a short, easy ride down our lane and back and there was no indication of any problem. Then I took it out on the county road and drove it normal until it warmed up and then turned around and drove it hard -- up a hill, full throttle, foot to the floor, winding out each gear (shifting at about 5,200 rpm). Not a single indication of a problem, it was exactly as it has always been. If I hadn't experienced the last few days with this issue, I'd say there was nothing wrong. I find it difficult to believe that replacing the fuel filter had any significant impact on this situation.
I greatly appreciate all the time spent sharing your thoughts. At this point, I feel to monitor this for a while. Thanks to "HawaiiMud" on another forum, I found the test fitting (it is on the back end of the passenger-side fuel rail -- see photo) so I'll get a tester and check the pressure. Assuming that is good, I'm going to wait and see if I have another instance of the "won't start after coming back out of the store". If that happens, I'll call it done and replace the fuel pump.
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