In park or N the engine will rev up to 6-7k with no problems. When driving between 3-4 k the engine will bog down. Throttle seems to be ok with very light inputs, but if you push on it the engine bogs down, stumbles and after the throttle is let off recovers fine. Any help is appreciated.

 

I'd start by checking the plugs, although it more likely to be the secondary injectors.

The whole procedure is in the fuel & emmissions section of the manuals.
Check out the link in my sig.
Download & print what you need.