The wiring harness must have been damaged when I put the engine back in. It looks like pin 54 of the ECU is the hard idle. I will pull the ECU cable and ring it out with a fluke to verify continuity. I think there is more to this though. Maybe more than one wire was damaged. [ http://graph.darren-criss.org/2016/02/15/300zx-ecu-wiring-diagram-l-03fe45ccecbd42d9.jpg ]
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