When all else fails, try something else.
The previous plan sounded good when I thought of it, but was lacking in execution.
I couldn't find the EGR valve so I started the engine and was greeted with the expected fluctuating idle. In desperation I disconnected the electrical connection to the Mass Air Flow Sensor and the idle got a bit worse. When I reconnected the MAF the idle instantly corrected itself and is running fine now.
Maybe someone who understands the system better than I (everyone) can explain how that worked?
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'93 XLT 3.0L 2WD, Auto, 77K mi. Works good, lasts a long time.
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