hey i have a 1996 ford f 350 7.3 it has 370000 km on it and is super hard to start when cold. ?? when you get it running it has no power at all till it warms up. once it warms up it seems to work good from 1000 to 2000 rmp then anything pretty much above that it just falls on its face and puffs alot of blue smoke at thos rpm and quess ??? thanks

 

sounds to me like you have a compression leak somewhere and check the glow plugs for the hard cold starting

 

sounds like injectors going out possibly HPOP too