1991 Ford Tempo vehicle turns off while running or in parki

So what was the original problem that led you to replace those parts? And how was it diagnosed? When you say off and on again do you mean restart it? Does the fuel pressure remain steady when it stalls? Does it matter if it's hot or cold engine?

When it starts running erratically giving it more gas has no effect? Have you let it idle and watched the fuel pressure? Any pressure symptoms when the failure happens? Is the check engine light working? How long you owned the car? Fords are notorious for coil wire problems. What kind of time intervals are involved in the problems appearances. Maybe the computer is trying to lean the mixture to much? Maybe an injector monitoring rig can reveal this? I'm not sure if the ford uses varying voltage or varying pulse width? Have you checked plugs for color? Are they too white looking?