89SCK@T,
Check your Crank positions sensor. Is your shift light coming on by chance (the yellow up arrow on the tach gauge). If it is then it's definately the CPS. Same thing happened to me last year.....driving ,driving, driving, them boom car shut off. Turns out, the mounting bolts to my CPS came loose and the harmonic balancer disintegrated the CPS and bent a fin on the harmonic balancer. So I replaced by balancer and a new CSP, w/ a new crank bolt for peace of mind.
Let me know your progress. There's nothing better than having others brainstorm idea's with you.
....back to the original topic, I'm up for a SC lunch/meet sometime.
Metalman