Words cannot describe my loathing for this car this evening. She fried the cat, and has had intermittent spark. Given those two items and the advice above, I replaced the catalytic converter, ignition control module, and coil today. Fired her up - no change. Sigh. To sum:
Parts replaced in this hunt: O2 sensor, ignition control module, coil, plugs, plug wires, cap and rotor, injectors and seals, fuel pressure regulator, catalytic converter and downpipe, coolant temp sensor.
Revs ok but not great cold. Does not rev once warm. I can hold the throttle wide open warm and the engine will do a boggy ~1200 rpm.
Fuel pressure is at spec. Spark looks erratic on two cylinders as the motor revs up. Flywheel sensors? Distributor?