I'm having a problem dyognosing the fuel injector's.  First the fuel-
pump was replaced.  There's fuel pressure reaching the carburator when
I turn the ignition key. However, there's no fuel spaying into the
throttle body. I've tried to taking the injector cover off and running
a jumper wire to each injector, using a test-light. The test light
come comes on but, the injectors don't spray. If I leave the ignition
key on for a minute, the truck does want to kind of start, but quickly
turns off. If I spray fuel starter the truck does turn on for a few
seconds. All electrical is fine on the truck can anyone please help.