Got my codes pulled yesterday at my buddy's shop...The only one was code 556 : Fuel Pump circuit failure
Which he said was common among Ford's with replaced fuel pump's.
Kris, that is the primary FP circuit code IIRC. It can mean that the pump lost its loaded power feed for a split second for some reason, or that there is a more serious issue.
Havent noticed anything in particular...The idle is always kind of "missy", so to speak..It isnt a very smooth idle and sometimes she dies when i stop at a stop sign or a red light.