At a loss???? Help With Jerking / Hesitation....

I have a 2002 Ford Expedition 5.4 My problem started with a Jerking and hesitation... Replaced COPS and Plugs which I thought fixed the problem. A few days later it acted like it wasn't getting fuel when I tried to start it. I replaced the fuel pump and filter. Truck started fine with no problems. Just a few days later the hesitation returned but this time it was different then before. It happens at anytime not just under a load and jerks very hard. Sometimes the truck will even shut off completely but starts right away. Sometimes leaving from a stop it will jerk or shut off. I have also replaced the crank trigger sensor, EGR valve check all vacuum lines. No codes are showing up. Gas milage is TERRIBLE around 8-10 mpg. Any Suggestions