Way late yo the party but, my 85 did a similar thing off and on after a fresh rebuild. It ended up being a broken injector wire under the plenum. It would warm up and swell a little and it was drivable. In the cold it was hard to get warmed up. I finally gave up and had my buddy best shop electrical guy figure it out. Now she has been perfect in that regard for over 2 years.
So if it starts up again its another place to look.
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