I have a 2005 f350 6.0 can't complaint for what I got. Some people say that the truck is not a good make with that 6.0 now I was on the turnpike and start hesitating or losing power. The mechanic told me it was an injector but after I changed the diesel filters didn't happened again. I went on vacation for a week and now is doing it again, my mechanic keep saying that its an injector, does anyone know anything about this.

How about having a diesel injection shop test the injectors and see if you do have one that's beginning to fail. THey can be tested... usually rebuilt.. and is cheaper that just simply just replacing even one.