Look above posts for your user name, click on it, drop down to modify signature, get er done. I am a bit worried that the fuel cleaner is pointing to the injectors. Los of the cleaners also contain a lube, that would point to a sticking injector. Klhansen may drop in on this post to add advice I have him on speed dial for my problems and I would follow his advice over mine (unless I disagree of course) Did it run fine for 500 mi and then start symptoms? Crawl under the truck and see if you have a wet exhaust on one side or the other.
Early 1999 F350 AUTO 4x4 CC LB DRW 4.10 6.0 trans cooler, Front hitch, 2,000 hubs/ brakes, Bilstein shocks/steering stabilizer, Diesel site coolant filter 203 thermostat, EBV delete, new O-rings, new Oil cooler, RIFF RAFF FRX, Glow plug led, Pillar gauges, Lighted cupholder, Painless wiring fuze block, Harpoon/hutch mods, Removed axle blocks. Air bags, 5 wheel hitch, In bed 7 pin plug. Spare tire key delete. KLHANSEN on speed dial. 75,000 as of May 2019