It just started last night it seems like it's not accelerating as fast as it usually does. A few of my plug wires are a little worn I have brand new spark plugs and my injectors aren't very old at all. New fuel pressure regulator any suggestions?

 

Yeah, new plug wires along with cap and rotor
That should fix it up

 

okay. im gettin a new msd streetfire ignition coil and i need a new serpentine belt. my old one is worn down and ill need a new one that is smaller when i change out my pullys. any specific brand i should get?

the i have is just a standerd eguipment one and it didnt last long at all

 

Goodyear makes belts, they should be good. I'd check the computer for codes, this thread will tell you how:
https://www.f150forum.com/f10/how-retrieve-trouble-codes-obdi-10907/