First: Is there still a harness connection below the oil cooler on the driver's side of the engine? If that connection is still there, cut it out and replace it with quality crimped and shrink-tubed connectors. It's a nasty job, but that harness connection is a huge pain in the a$$.
Next: check the computer power leads and relays for function and corrosion.
Next: Check the harness going to the cam position sensor. It's a royal pain but unbolt the brackets holding it on and strip off the loom. Check it over 100% for any insulation wear.
Next: check the wiring harness under those valve covers and make sure you do not have any burned connectors.
The last thing I would do is: when it starts messing up, unplug the ipr sensor (stack of quarters looking thing with wires on the end, sticking out of the hpop pointed right at the drivers seat). If it runs better, you ipr is sticking or bad.
I do not think you have a sensor problem, it sounds like they have all been changed anyway. I do not think you have a problem with the IDM, etc. to be honest, those don't go bad too often. Your main problem is, your 7.3 is a generation removed from the mechanics that are working on diesels now. I'd call the local school district bus barn and see if one of their mechanics wants a weekend cash job. That navistar engine is still running in thousands of buses in this country and those poor bus mechanics KNOW how to fix them.
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