1998 7.4L on a p30 Chassis RV (injection) seemed to be choking when first started going from normal revs to low revs and back up several times. Usually if I would play around with the gas pedal, it would stop doing that or after a short while would go back to normal. The other day, after starting, I turned it off for a few minutes. Since then, it won't start. ITs turning and turning but won't fire up. I checked the fuel filter and it's fine. Generator is running ok. It passed smog a month ago. Checked for error codes and none.
Any ideas on what it could be?
Thank you.

 

When was last full tune up? Plugs, cap, rotor, wires; are you getting spark? Is it trying to fire at all??