Getting on it hard this morning and got a p1211 low/ high desired icp pressure. Ive noticed that I have had a power loss, have to get in throttle little more then I used too to even get the truck moving. I was watching my throttle position %, icp pressure and ipr %. At 80% throttle the ipr % jumps to 45% and icp will go from 2600 psi to 2000 psi, and sometimes all the way to 1000 psi and I still dont have it wot. I have tried to get it above 2600 psi but it wont, just falls down to 1000psi. I have had no issues with starting hot or cold, no fuel in oil and loss of power with lots of black smoke in o.d. when I stomp on it. i feel like its my HPOP but would like to know what else it could be.