Kaput!

My 85 Vanagon has always run like a finely oiled sewing machine, but the
other day it gave me a problem.  While going along at 35 or so, it just
quit, kaput!
It would turn over, but not start � I was in a dangerous location, so I
called for a tow.  Once back home, and after an hour or so, it fired right
up and seems to be running fine again?!  Can anyone offer any suggestions
on where to start?  I�m hesitant on taking it out again for fear of this
happening again.  Any help would be greatly appreciated�

-Herr Brandt-