It must crank OK?
Could be ratty or broken connections- ground or positive.

Try to determine if you lost ignition or fuel. Look at the plugs.
You can check for spark when it quits, that will help narrow down things.


If you can get it to quit with the headlights, you can check to see
if you lose power to the FI or RSR relay coils if it's fuel.
If it stays dead with the lights on it will be easier to fix.