When I bought my diesel I made all the common mistakes and it drove me nuts. They are very simple to work on, but if you don’t know the basics they will seem like the most unreliable nightmare you’ve ever owned. Most of the time they don’t need actual work, they just need maintenance. The engines themselves can run a half million miles before needing a rebuild. Unfortunately in the wrong hands the usually last much less. I include myself in that group, but I am now the wiser for all of my mistakes.
Yup, I had an 88 with the 7.3. Finally got the glow plug system working good. Replaced the pump got it "close" and had my mechanic time it.
I asked was it close, he says no!