Late 04 6.0. When i start the truck after its sat a couple hours and i go to drive it, it seems to run great and have plenty of power. On occasion after the truck is warmed up it seems to be lacking power. It has a newer hpop, new stand pipes and dummy plugs, fairly new fuel filters and 50 miles on an oil change with an oem filter. The fuel pressure is good. Generally in the 60-70 psi range. Boost seems to be where it should be when the truck is cold and warm. The only codes i have are for the egr since its deleted, a code for the #6 glow plug even though it was just replaced, b1352, and u1262. A few months ago when i had hpop issues there was a code saying something about invalid coolant data or something like that. But doesn't show up anymore.