[scottfab]

This could be tough to find. Starting at fuel is probably easiest but
if you were in under the plenum the DIS maybe involved. (loose connector).
Obviously the trick is to get the failure to happen while looking at fuel pressure. Having a gauge attached to the windshield is easy enough but
getting the stubble/fail after that could get frustrating.
Maybe you'll get lucky and see the fuel pressure drop while idling for a long period.
Hang in there. You'll find it.