Surging
 

My truck is running weird all of the sudden when I am going up a incline the truck start surging cant think of any other word to describe it. And when it is doing that the boost gauge if it is on 15 psi the needle moves from 14 to 15. Then it quits when I am on flat ground. Another thing is they told me about a year ago my number 7 injector was messing up. And I just reconditioned the turbo 2 months ago

Anything done to it mod wise?

It has a 5in exhaust no cat k&n air filter and a sct tuner other than that no. Please help need some advice on what you think it might be