1992 Ford F-150 truck quit runnig

Ford p/u never let me down then one day it stalled ran ruff I could not keep it runnning. I have good spark and 40 psi at the injector rail.I have replaced, tps sensor fuel regulator, distributor and pip sensor, icm, ignition swith truck will run if you put gas down the snorkle. There is power at both terminals of the injectors. If I pull out the fuel relay and let it touch the contacts you can fell the injecters click and the truck started for a few seconds codes 22, 21, 24, 53, 54, 95 these codes were retrieved after we started it by pouring gas down the snorkle before that only 22and53 were there. Any help would be appreicated as ijust dont seem to be getting any closer