DL, my disc schematic shows a purple wire coming from the ignition "crank" position connector to pin #10 on the engine harness connector (your photo), then out to the idle speed control unit, which is under the passenger footwell.
I tried to get the lid off my '91 to look at it, but it strongly resisted, and I decided not to force it. I did see the purple wire coming in the lower bundle, and a similar wire exiting into the top bundle.
I also have a paper schematic of an '86, which shows no additional wires connected thru pin #10, but your photo seems to show all 14 pins connected?

I assume the purple wire sets the idle speed control during engine cranking, adding more air to aid starting? I guess if it were disconnedted, symptoms might be slow starting when warm? If the loose purple wire comes from the car interior, you might attach a voltmeter, turn the switch to start and see if you get voltage?

Of course, when dealing with these hard-to-decipher schematic discs, the usual disclaimers apply - ha. Hope this helps.

DG