That would point to some of that crap insulation falling off and shorting out the wire. Real issue for both your 85 and my 86 years. The wires on that connector in Inga was so bad that I had to chop them out and replace them.
Bet if you look around there is a bare spot touching chassis some place. You can break out the Ohmmeter to be sure, put a lead on chassis (Engine Block) and that wire and see if you have a low resistance.
Be ready, if that is bad you may find others in the same bundle of wire.
Good Luck,
Paul
PS: Did not know that would cause acceleration issues, good find!
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