Thanks for you question.
So were any fault codes retrieved?
Fuel pressure tests?
You can go to some parts stores and they can run codes for you for free. I can give you a better clue to what might be happening if I had some fault codes.
Thanks
FORD MOTOR COMPANY CAR AND POWERSTROKE SPECIALIST FOR OVER 16 YEARS. ASE MASTER SINCE 1991. CURRENTLY WORK AT A MAJOR FORD DEALERSHIP. GIVE ME YOUR FORD PRODUCT QUESTIONS, IF I HELPED, PLEASE HIT THE ACCEPT BUTTON. EXPERTS QUESTIONS ON FORDS WELCOMED