2012 international 4400 maxxforce dt

Recently purchased a truck 2012 international 4400 with maxxforce dt. Notice it sluggish and lacked bottom end power. Twice it seemed as if it we got full power Reving out with power for a minute or two then goes back to being sluggish. Cleans turbo front housing and blades from coked oil as well as flushed water to air intercooler between the small and big turbo. Ran truck for a while seem sluggish then all of a sudden all the power came back for a while, parked truck for a bit started it up drove for 10 minutes on full power then truck just went back to no bottom end power. Truck has no codes or anything

 

I cleaned both turbo housings,flushed the intercooler between hp and lp turbos. Truck ran sluggish as usual Friday night. Yesterday it ran sluggish for i while then it got full power, parked truck for a while then started it back up truck ran with full power for about 15minutes then when to being sluggish.