The fascinating thing about engine diagnostics is that the engine is an
utterly and completely logical system, with no emotions, viruses, bacteria,
gremlins, demons, or any of the other maladies we humans are beset with.
That means you depend on your own powers of observation, testing, and
logical concatenation in fixing them; and you're also faced with the classic
logical fallacies inherent in "jumping to conclusions." The present case is
a great example of the "post hoc, ergo propter hoc" fallacy, ie., "after I
changed the injectors (the car wouldn't start), therefore, because of
changing the injectors (it wouldn't start.)"  It's right out of Aristotle.
I'm always amazed at the little respect auto mechanics get when, compared to
so many other lines of work, the field demands such a high degree of mental
discipline. Congratulations on getting the rig up and running again, and
careful of those logical potholes in the road!