I have 94 chev truck 1500 with the 4.3 v6 4 wheel. THIS truck won't start , and I drive it home. Its got spark, I check the timing, its good, its got new spark plug wires and spark plugs, new destubutor and cap, change the map sentor, and its got a new gas pump. Still not start up.

Make sure you replace the Ignition Control Module (ICM), if it has not been replaced in the last 120,000 miles. This link may help:

https://www.askmehelpdesk.com/cars-t...ml#post2123675

I've done replace the ICM too.

Have you checked for injector pulse?
Does the check engine light come on? Do you have a way to check for diagnostic trouble codes?
Why did you replace the sensor and pump?

I even check compresion on every spark plug and everything good, I check the sensor and pump to try everything and no check engine light come on. I thing the computer, but I don't know

Does the check engine light come on with the key on engine off?
Those ECMs are original OBDI and are plentiful in the used and aftermarket. It's a simple swap if you know what you're doing and since you've tried nearly everything else, why not try an ECM.
Still, it would be nice to have a scan tool to check some data.