Great answers from Bill Boyd...

Hello Michael,

There is the ever faithful fuel issues...
GETTING an OBD reading (ON-BOARD Diagnostic)

wouldn't hurt...

Failing all that (fire & fuel) you need to check your
catalytic converter and/or muffler to assure
EXHAUST can get out...

There's no elegant test for that...

Penetrating oil... remove exhaust below header...

If it starts...
you know what needs to be replaced before
you can drive it again.

Happy hunting... hope this helps.

Problem areas are
cam/crank position sensors
immobilizer operation
ignition switch
ignition control module
ECM
battery fuse
broken timing belt ( most likely if it just shut down when driving)