I had a friend put a Wiring specialty harness into a 240sx. It started having misfires at random. Finally I found that one of the pins in the harness wasn't making good contact with the ECU.
I had to shove some bits of wire in there to get it to be consistent.
Just a heads up that WS isn't exactly quality control
maybe the orange one isn't really making good contact in the ECU plug sometimes.
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