[old_master]

Fuel pressure is too low, must be 60 to 66psi. The fact that the pressure holds, indicates that the lines, injectors, and pressure regulator, (all under the plenum) are more than likely ok, and that the fuel pump is weak. Check pump output by installing a fused jumper wire to the pump feed wire, slowly restrict the return line while watching fuel pressure, do not allow it to rise above 75psi. If pressure will not reach 75psi, the pump is weak and will need replacement.