Ok this is on my sisters Ford Freestyle not a f150 but figured I would give it a shot on here.
These are the codes Autozone pulled
She has a throttle actuator control system code popping up.
And a internal control module torque calculation performance error.

Sometimes it stalls out.

Any idea what needs to be done to fix this? The kid at the parts store seemed lost.

 

sounds like theres something wrong with the drive by wire system