Not idling properly and continually stalls and won't stay running.

Hello,

Sounds like the issue could be with the idle air control valve, also known as air bypass valve for these Ford trucks.
That valve is located on the throttle body.
It controls the idle speed of the engine, and a malfunctioning or dirty bypass valve can have similar drivability issues that you have been experiencing.
Over time larger air particles can get stuck to the inside of the valve and crease air flow restrictions. This can lead to poor idle or engine stalling at idle.

Cleaning out the valve can improve the idle quality.

Here is a helpful guide:

https://www.2carpros.com/articles/idle-air-control-valve-service

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.