You're absolutely right, the wiring documentation is virtually non-existent for this swap. However I'm pretty sure I have the wiring done properly, considering both the stock 98 LTZ and 00 GTP PCM's will start and run the car. That's what leads me to be believe it's a PCM issue. Regarding the two-speed fuel pump, the way that works as I understand it, is a second output from the PCM switches on and off a resistor in the relay that reduces voltage to the pump. My car does not have that special relay+resistor, just a regular 4-post relay. So regardless of whether the PCM is asking for low or high speed, the pump is always getting full power. Although looking at the Mitchell diagrams I don't see that resistor, so maybe I'm wrong about how it works (or Mitchell is)... In any case, I did try with a jumper wire in place of the relay to run the pump hard-wired, and that made no difference and still had a single cylinder fire and then nothing. That was before I discovered the additional C2-24 power wire though. I will test that and report back. If adding that power wire *and* hard wiring the fuel pump allows the car to run, does that suggest a VATS issue?
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