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I pulled the harness mostly back out so I could run the 4 lo wire and see what the deal was with the MAF sensor. I was thinking that I attached one to many black/white ground wires together. GM uses black and black/white wires for sensor wires too, not just grounds. Well, that wasn't the problem, they were all good. When I shortened the harness, I staggered the solder connections so there wasn't any next to each other and used shrink tube. For whatever reason, I didn't stagger the MAF wires. Well the shrink tube shrank too far, and a few pointy soldered wires were sticking out and touching the other wire. I fixed those and now the IAT reads within 2 degrees of the coolant temp, or room temp... I'll know tomorrow how the 4 lo wire works out.
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