I recently cleaned my maf, changed oil and filter, changed fuel firer, cleaned throttle body and my truck is still hesitating when under heavy load or "flooring it "

 

You need to lower your spare and then take a short crawl underneath. The FPDM has 2 bolts and 1 double or triple wire plug with quick disconnect. Take it off and inspect for corrosion. Most are corroded to the point of total body failure.
Buy a new one on Amazon for ~$60.

 

Joe, would that have an effect on me flooring the gas pedal and the truck spuddering ? (The FDCM)

 

FPDM...yes it would...but so would bad plugs...bad COP's

 

Ok, plugs were motorcraft 2.5 years ago and COPs Saturday but in gonna take a look at it after work

 

I'm thinking of the worst and hoping for the best cause I would think my plugs are still good cause they don't have even 20kmiles and my COPs are brand new so I'm freakin out. I'm OCD with my truck

 

So just check the easy stuff first. The FPDM is real easy - after you get that damned spare tire out of the way.
You probably need a little exercise anyway - LOL.

 

anything to look for in particular besides corrosion?

 

No just corrosion and breaks in the body of the FPDM. I haven't heard of any of them that are fine haha. They usually all have damage. Doesn't matter if your roads use salt or not, there will still be corrosion because of the dissimilar metals touching each other. The salt/water combo just speeds it up.

 

im having issues with like a shutter or studder around 55 mph. I'm going 55 and truck is in overdrive, if I give it enlighten gas to speed up but not shift out it starts to like studder, as if it wants to shift out but doesn't. Almost like it's doing it but really fast. Also every now and again when my trucks cold and I start it it's has a rough start, kinda turns over a couple times like regular the start to lope like a dang cam and fire up. FPDM or plugs?