Truck wont start

I have replaced my ignition switch, the starter and the ignition coil and it still won't start. I was driving it one day and it just cut off on me. I have tried starter fluid to start it and it won't even fire. I can get it to turn over but that is it, it won't actually fire and start. Does anybody have any suggestions? Also just in case it matter, it is a 4x4 with the 4.3L vortec engine.

Have you checked to see if you actually have spark?

Is the distributor turning?

Do you have power and ground to the coil?

Do you have power and ground at the module?

Do you have coil pulse?

Do you have injector pulse?

If your missing the two above maybe the pickup coil has gone bad.

What year is it?

I will check to see if it is any of those and post back what i find out, thanks. It is a 94 btw.