97 Conti - No start

I have a 97 continential. While riding it shuts off (on freeway) and will not start for 1 hr. The last time it shut off it did not start. Performed major tune-up, replace fuel filter and air filter. Fuel inertia cutoff switch is OK.
NEED HELP

Is it running the check engine light?
Could be as simple as fuel cap not venting, and that would normally throw the CEL.