Loss of speed

A clutch won't cause that unless it's to far out of adjustment and slips. But you would/should notice that. Sounds to me like whoever did the deletes on your engine didn't do anything for the programming in the ecm. And that is a subject that we can't talk about here.

 

I'd say check the basics, fuel pressure, boost leaks, and maybe even an injector cut out test.

How did the truck run before it had the deletes done?

 

Bad delete. Oh how many I've seen........

 

Almost sounds like a de-rate which considering what you had done to the motor, is a distinct possibility. If you delete those things, and don't change the ecm settings, it goes into de-rate mode to protect itself. How many lbs of boost are you making? Check leaks around intercooler, boots on turbo piping, fuel pressure inline. Get a temp gun and shoot the exhaust ports on the manifold to see if all injectors are firing and heating the cylinders.

 

i second qualitytruck bad delete take it back to who did it to fix properly if they even know how biggest issue on delete nowdays no reliability.