My truck was running fine and lost power and started missing. I limped it home my icp reads 460-500 psi at idle and 1250psi at 3,000 rpm. The ipr was 7.52% at idle and fuel pressure is at 54psi.
You might try unplugging the Engine Oil Temp sensor on the back of the HPOP reservoir. There's a slight chance it might be affecting the ICP signal. My vote is on a wiring issue, though.Plus it only happens once the truck gets up to temp.