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sounds like bad coil paks and plugs. if check engine light is on you need the codes and it will tell you which plug and coil pack is bad. auto zone will scan it for free and tell you which plug and coil pack
its a bad coil. coils boost the voltage of the spark to make it strong enough to ignite the fuel mixture. you will have no combustion per every cylinder with a bad coil. im pretty sure its electronic ignition on 2004+ 5.4l motors, so its not anything mechanical. if it was the ECM, you'd have no pre-coil voltage either.
A common problem with fords with a coil on plug set up is that the coils go bad. If there is no check engine light on. With the car running unplug one fuel injector at a time and see if the engine stumbles harder. If it does then that coil is good. If you notice no change then that coil is bad. Most of the time to 2 in the back on both side go bad. I would try those first. Let us know how it goes.