Ouch. I'm guessing it is the 6.0 Navistar turbo diesel, but that is a guess. Quite a few ended up in ambulances. Lots of problems with that engine including a class action lawsuit. Google it for the identifying info. If it is the 6.0 - I recommend you swap it out. Don't fix it. Lots of info online as to potential donor engines and why this engine is poorly designed. But check. I'm just guessing
Many diesel issues lately seem to be fuel related - pump, injectors, or contaminated/old fuel. The newer low sulfur fuels are hard on the engines and the newer blends of diesel fuel seem to not like sitting for long periods of time. Make sure you use an additive like Sea Foam (yes, it is really called that) to make up for the lower lubrication factor of the newer fuels - especially if it sits for longer periods of time. In the old days you just used additives for freezing weather. Now it is mandatory all times. Critical to start it at least once a week and drive it for some distance. Try not to let the fuel get more that 6 months old.
For future reference: When you blow an injector it resembles a blown engine (common event with older diesels especially if it has Delco injectors). It will smoke in the worst way, rattle like death, and be low on power. Injectors are under tremendous pressure usually creating a sudden failure. Rookie mechanics will often start prematurely stripping the engine or write it off as dead assuming it is a major mechanical failure. I always start troubleshooting mysterious diesel problems with the fuel system. Surprising how many times it is something simple and cheap.
Good luck. Around here the best diesel mechanics work on construction equipment. Those guys understand the bush-fix. You might want to look that direction.
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