My engine cranks over but will not run?

Driving truck about 35 mph and suddenly it stops running. Will crank no start. After hours if I try starting, it will start but fails after less than a second and will continue to no start condition. I've check fuel pressure and after turning and turning off key to the on position, it will pressure to 60 psi, and will spit out gas after disconnect of gauge so I know it is getting fuel. I've sprayed starting fluid and there is no change when cranking. I've checked first plug when cranking and its getting a good spark. I've checked fuses in the engine compartment as well as in the dash and they are not burnt. I changed the crankcase position sensor only because I had one lying around. I was thinking of checking injectors but didn't want to take out intake manifold unless it is necessary. Any advise is much appreciated. Thank you in advance.

Note: It has no aftermarket security system and the factory system alarm seems to be working okay with no dash lights flashing. I also disconnected the truck battery to reset the computer.