http://personal.utulsa.edu/~nathan-buchanan/93fsm/engine/86troubles.pdfThat should be the general test procedures for all of the sensors on the 3.0. It could actually be as simple as a shorted wire somewhere. If you test all of the applicable sensors (that factor into the mixture), and they're good, I would suspect the short, or a broken wire. I think I remembered you already swapped a different ECU to test?
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