1995 Ford F1-50 300 straight 6 electrical fuel injection problem?

We have checked the fuses and all the wires the fuel pump kicks on it has pressure we have tested the injectors manually and they spray but when you hook them back up to the truck they won't spray anyone got any ideas

Added (1). we can pour gas in the intake and it runs for a second but once you quit feeding it dies

Sounds like the ECM isn't triggering the injectors.

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