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Of course, if the car were here, I'd stick a different computer on it, put the fuel pump relay connection back to factory, and see. You don't have that option. After that, I'd start checking individual components.
Since you replaced the harness and the temp sensors, you've ruled out "incorrect temperature information" being the problem. This basically leaves the pressure switch (acceleration enrichment), the warm up regulator, the frequency valve, the frequency valve relay, the 02 sensor, and the computer. The most likely of these is the warm-up regulator, the least likely the acceleration enrichment switch.
I'm assuming that when hooked up correctly, your car runs well for say the first five minutes, and then starts running poorly. If I misunderstood, let me know. I suspect your car never comes out of warm up mode. You'll have to test each component for proper values. These components being the 02 sensor, the frequency valve, the warm-up regulator, etc.
You know, the more I think about it, the more I think the problem would be the frequency valve relay, or the warm-up regulator. Both provide a ground; both get signal from the fuel pump relay. But I could be way off...
Hope this helps,
Chris
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