I have an 04 f250 6.0 powerstroke every so often has hard time starting it will keep cranking i know your not soppose to use starting fluid but will start right up and when i drive it will run awsome tons of power then all sudden lose all of it floor it and rpms go up but barly has any ***** need help driving me nuts i replaced icp sensor ever thing my icp is reading 580 psi warm with .21 duty cycle hope its not hpop or valve i cant figure it out lol