Have already replaced HPOP, IPR, resealed all injectors. Ran truck and still run badly. Ran cylinder contribution test and gave code for #6, replaced #6 and ran test again and still showing #6 bad. Truck runs good then starts slowing down and sluggish. I have already spent $2500 on this thing. Im open for any suggestions. Is there any possibility that the IDM is going bad? 2000 E350 7.3

 

problem fixed, pre-filters stopped up

 

thanks for the update

 

Pre filter's?as in fuel filters?where are they located?