I've changed plugs, wires, distributer cap, rotor, cam module, crankshaft positioning sensor, ignition module. It will turn over all day but won't fire. I need help

 

Have you pulled a spark plug wire off to see if there is spark? Have you pulled a spark plug to see if gas is on it?

 

Have you determined what it's NOT getting?
Is it no fuel? Or is it NOT getting spark?

 

I had a truck like this come into my stall a few weeks ago.

The owner did an intake gasket on it but didn't stab the distributor right. Cranked great, sputtered pretty good and would almost start. Put your #1 cylinder (driver side one closest to the front bumper) into TDC (Look at the harmonic balancer and look for the line and line it up with the timing tab on the cover) and aim your distributor rotor at the little stamped number "6" on the edge of the distributor housing. Re-assemble and fire it up.

Also I suggest you change the oil to get the gas out of it if you're been cranking it for a long time with no results. If your oil smells like gas, change it so you don't wash out your bearings. $30 for an oil change compared to new bearings sounds like a heck of a deal to me if your oil smells like gas.

But to what in2trux said, what of the three (four kinda) things is your engine not getting? Spark, fuel, compression and air.