Your most likely not getting spark. Take off a wire off of a plug and set the end against something metalic with a small gap. Youll need to diagnose it going backwards from the plug. Sounds like a good time for a tuneup though a fresh set of wires plugs distributor cap rotor and coil can be had for less than 100 on rockauto. It will give your truck a new breath of life.

Even if you had low compression you would hear erratic firing.