I have a 1989 chevy caprice wit a fuel injected 350. I replaced the fuel pump and the fuel pump relay. I also changed every fuse in the inside of the car. I have gas coming up to my throttle body. But the car won't unless I spray carb cleaner in it. And it doesnt crank everytime.. But it runs a while then kills. But while its run'n I don't see any gas shooting out of the injectors. What could be my problem??

The injectors on a TBI are going to spray gas only when the engine cranks over not when the key is turned on. With that said you may have a bad pressure regulator in the TBI. The rubber in it may have a hole in it not allowing it to build pressure for the injectors. However, before doing that I would check to be sure I had power to the injectors. You can purchase a noid light at the parts store and check to ensure you have power to the injectors in the TBI they are not that much.

You may wanna replace your injectors them self