Truck starts only every couple of hours?

Diagnostic fault codes never say to replace a part or that one is bad. They only indicate the circuit that needs further diagnosis, or the unacceptable operating condition. When a sensor or other part is referenced in a fault code, it is actually the cause of that code only about half of the time.

What are the exact fault code numbers you found? What are the symptoms when the "no-start" occurs? Does the starter crank the engine? This can be hard to tell, but can you hear the hum of the fuel pump for about one second after you turn on the ignition switch?