Truck will only start with starter fluid but won't stay running I can hear the fuel pump kick on and it turns over and acts like it's gonna fire up but won't

Use a gage and check proper fuel pressure, 44--54 psi, If your in the middle, should be fine. Any applicable trouble codes? Engine cranking do you have fuel injector pulse?

Here's another thought, make sure battery has a full charge and connections all good.

Make sure you had the proper fuel pressure also check the quality of the fuel make sure it’s not contaminated did you recently put gas in your car If you’ve been driving on the same gas and the symptoms just started make sure you have proper fuel pressure

Carburetor maybe really dirty clean with carburetor spray cleaner use the whole can.