Did you get rid of the code 51?
I'd forget the harness, I'm pretty sure the impedance difference is enough that if the injectors and ignition were mismatched the would either not run or the injectors would burn up. If you tried running a pre89 wireharness with no injector resistor pack it wouldn't run either as there would be a break in the circuit. Does the ECU have grey plugs or yellow?
When you say you eliminated the ISCV does that mean you deleted it or just diagnosed it and are certain it's not suspect?
I haven't been following this thread so I need to go over everything before I can offer anything else.
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