I have been studying up on wiring harnesses for 1983 and 1985 just so happens 1988 is covered in manual. The wiring schematic is very different for 2.3 than 5.0 in most of circuits it has extra circuits for the 4cyl not common for the 8cyl. I would suggest you invest into clymers manual as it covers the differences and you can easily trace your missing wire down.
Yo probably have more than one wire out of sync regardless if the all connectors plugged into the v8.
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