my x is driving me crazy

[fine an u]

i have a02 x 95k 4inch exhaust superchip microtuner. When i go into the throttle very aggressive truck just falls on its face. go steady into it seems fine. stock codes runs fine high performance runs fine othe than code 1211 hp only. tow safe is where the problem occurs only code is 0603 which superchips says is normal ive cleaned bpt new cps could it be maf not working right getting ready to pull camper this weekend any help or ideas is much accepted 7.3 powerstroke

 

[95_stroker]

P1211 is a lack of high pressure oil. You are running out of HPO when you are getting into the throttle good in the higher horse settings. Your IPR valve may be getting weak.