Any cat guys on here? LEE troubleshooting

[Hetdiesel]

I have a c-13 it's a lee prefix (that's comparable to the SDP c-15 ) component wise.
I'm getting a miss that comes and goes like a faulty injector.
Before I got to look at this truck I was told several months before a new ecm was installed don't know why. 800hrs on it now. Cat dealer replaced a injector for the same problem but never fixed the issue. I did cylinder cutouts with no success if I drive the truck I can pinpoint maybe #2 injector so I replaced it did not fix the problem. I found bad fuel lines so I thought air?? They needed replaced they were worn badly so I replaced them. Still nothing no CEL tomorrow I'm going to look into crank sensors I had one before feel like it shut off and come back on with no CEL and it was the sensor so I'm looking there. Just looking for some input anyone give me ideas ?