I ran a bottle of Red Line complete fuel system cleaner through the vehicle, but that didn't resolve the misfiring/stalling problem.
Also got in a Haynes manual for the car, but I didn't find anything in there to help diagnose. It's good to have anyway, though.
Internet research leads me to next check the fuel pressure sensor.
There are some known quality control problems associated with pressure sensors which cause misfiring and stalling behaviors.
So I'll replace that sensor and see if the problem resolves.
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