Ford - Gasoline - Expedition :: 2003 Dying While Driving, Will Restart Eventually

My wife has an '03 Ford Expedition with 110k miles on it. It began dying while driving. Sometimes while moving. Other times when stopping or idling. She would describe that sometimes when it began acting like it was going to die she could "give it gas" and it would revive, other times that wouldn't work. It would usually restart after one or two tries. Our local mechanic did a tune up and replaced a coil. During the trip she began hearing a sound of "metal shredding" and the car died and wouldn't restart. She had it towed to a ford dealer. They replaced the IAC valve.

After that the dying would continue but instead of dying right away it would "lose acceleration, and eventually die within a few seconds" Took it to another ford dealership and they replaced the fuel pump and relay. It would work fine for a few weeks and then start dying again. Another local mechanic noted the error code P0231 "Fuel Pump Secondary Circuit Low" He kept it for a few weeks and was able to get it to die for him once but not again. The dying continued. Sometimes it would work great for weeks, other times it would die continually on the same trip. Took it to a 3rd dealer and they couldn't find anything wrong.It dies in the cold and in the heat. Usually after driving at least 20 minutes into a trip. Once it dies once it will typically continue to do so until resting for a day or so. Sometimes with a full tank of gas, sometimes with a low tank.