Changed the plugs and wires, and it's working well now. Or at least for the 2 minutes I let it idle. We'll see how it does after running errands.
I suspect that the intermittent stalling problem was a separate issue, and may crop up again. But after considerable research, I suspect that the engine coolant temperature sensor is the culprit. Apparently a lot of Camry owners have had this problem and fixed it by replacing that sensor. But there's an easy test. If the problem manifests itself again, I just unplug that sensor. If it gets better, it was the sensor, and it needs replacing.
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