Linc, I have a 90 765T and mine did the same thing, only I was going 80-85 mph for a few miles. It stalled after I pulled over, with no check engine light or unusual gauge or idiot light indications. I restarted like nothing had happened but not run good. After a few more minutes all was normal again And I contined my journey. I don't recall any smoke. my guess is I may have been clogging a filter or screen somewhere due to hi speed fuel consumption. This occured to my car 2x over 2 years ago. Has not happened since and forgot about it until you mentioned it. Anyway, that is my theory, can't prove it. Never at lower speeds. Good luck finding this one.