k changed plugs running stock motocraft plugs new wires ,coils fuel filter chaanged dpfe ,tps, pretty much everything no codes thrown period but just a lack of power runs smooth revs great straight exhaust after cats use to spin the 44's no problem just cant figure it out?

any help much appreciated. thx

 

Clean the MAF and run some kind of muffler. Removing the muffler made it worse.

Spin 44's? That I would have to see. Specially with a 4six that's peak torque comes at 4000 rpms.

 

You prolly need 5.13 gears to spin 44's with a 4.6.

 

yes 5.13's and d60's check out my album,actually muffler's have been off way before this issue...https://www.f150online.com/forums/me...k-rampage.html

 

Should make a sig inthezone, - looks like you've done allot to that truck

Clean the MAF yet? That can those problems, -specially if your running an oiled air filter element.

BTW- It doesn't matter unless your custom tuned, - chopping the exhaust with the factory tune is a loser. If you were happy with crap torque before, I guess that doesn't matter then lol.

WAIT! You have a sig, you should post it ... All you do is scroll down before you post and check "show sig".

 

How old are the front O2 sensors?

.

 

how many miles are on the truck/tranny? how hard are you on the thing? maybe the motor is getting a little tired? i used to be able to smoke my 35's with stock gears up until i got around the 140k mark... motor started knocking 7k later... installed a built tranny and the motor is next on that list