Looking to do a sanity check . I picked up a 1997 f350 ,7.3 , 269k -for payment on a side job . The truck is pretty presentable but it's low on power . The previous owner claims it's always had very little pulling power . I put new o rings fuel lines and fuel filter into the fuel bowl . I did not notice any oil in the fuel , it looked nice and blue . I put a snap on scanner on the truck ran a buzz test passed , cylinder contribution test passed . Icp is .90 volts and 550lbs and 8-9% duty cycle which seems reasonable and indicative of no hydraulic faults in the injection system . The engine won't rev past 2700 rpm unless you leave your foot on the floor , when it does finally rev up it misses and pours lots of white smoke . A fresh oil change tonight gave it a little more power while driving but it still won't rev . I'm thinking due to the miles on the engine it's time for a set of injectors. Was wondering if anyone can add to this . Put a tire pressure gauge on the fuel bowl and it showed 50lbs pressure at idle . Inlet side of the turbo is clean and Not damaged . Thoughts ?