I just replaced the starter, starter relay, battery and starter modules F250 351cubic engine will crank like it is going to start but it doesnt even tried putting starter fluid

Make sure battery has a full charge and connections all good. Have a helper crank it, while you check for spark at the plugs. Also check proper fuel pressure and fuel injector pulse. How long since tune-up? Any applicable trouble codes? What about timing, spark or valve, where applicable. With distributor ignition, on some fords that tfi module is noted for problems. W/o some testing by you, I can't be definite about anything.