I HAVE PROBLEMS WITH MY 92 MAZDA 929. WHILE DRIVING ON THE FREEWAY AT ABOUT 80MPH THE ENGINE JUST STOP. NO LIGHT CAME ON OR NOTHING I TRIED TO RESTARTED AND IT WOULD NOT DO ANYTHING. ITS BEEN CHECKED FOR ELECTRICAL PROBLEMS ALREADY AND ALL THE NO BRAINER STUFF(I.E. SPARKPLUGS OIL ETC. WHAT ELSE COULD OF CAUSE THIS. I AM RUNNING OUT OF IDEAS HERE.
ANY FEEDBACK WOULD BE GREATLY APPRECIATED IT.
THANKS

The only guess I have based on your information is that the timing belt broke. The car may still turn over but not start with the exception of further engine problems to valves on some models.

Have you checked for fuel flow/pressure? Are you sure your timing belt didn't break or jump? Check output of crank position sensor as well.