Same thing happened to me with my '85 GMC. Lucky for me I was coming home from deer season in Vermont. Truck did the same thing to me at 9:30 at night at the top of the 5 mile grade into Franconia Notch. It was about 19 degrees with a 25 mph breeze from the North driving a snow squall with it. I had to sit there for about a half-hour after checking for spark and other stuff under the hood. Finally it started and I limped home, like you say, anywhere from 15 - 40 mph for the 150 mile ride home.
Turns out it was junk in the fuel that clogged my fuel filter and injection system and I discovered it came from the bottom of BOTH of my fuel tanks rusting on the bottom from water condensation that had just sat there for a while. It was a costly repair cleaning the fuel system and replacing both tanks.
Good Luck Charlie
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