Hi all - my 03 F-250 has been hard starting for the past couple of weeks which I'm trying to diagnose - 1st start of the day takes 3 or 4 tries but then starts ok after that. But what is really causing an issue is that my ICP pressure drops when I push the throttle pas about half way - from 1400-1500 at steady speed, maybe 30% IPR to 600 and 85% IPR once I push the pedal down. It's completely repeatable. Reducing throttle back down will cause the ICP to go right back, and I can hear the injectors change tone when they do. Truck has about 115k miles. I have had the truck for a couple of years but its my nice farm truck and I don't drive it a lot. Is this a failure mode of the IPR? Or of the HPOP itself? It seems to me that if the pump was failing it would have a max pressure it could build and it would stay there, not crash out like it does, or it's somehow running out of volume to pump when the ECM is calling for more.