BGarofalo

Im trying to figure out what this problem is with my truck. I have an 03 that has a miss to it at high rpm.
Symptoms:
1. At idle when you put your foot to the floor, at about 3000 and up, it breaks up and pops real bad. Its like the truck is defueling but not how it should be...
2. This is with no electronics on at all, and it dosent change with electronics on either.
3. With the TnT-R it will rev to about 3500 and break up and pop real bad and not go any higher. At times I can get it up further but it still breaks up and pops bad.
4.This is not a new issue it has been ongoing for a while now but is getting worse

I have tried alot of things already in my diagnosis but am running low on ideas...
I have not checked rail pressure readings, im waiting on a gauge to be delivered... While im in limbo does anyone have any ideas??