I've been through the ringer with this truck. L99 7.3l. 370,xxxmi. Replaced cps, ipr, icp, hpop, injector orings, hp oil lines. I replaced all of these things but the hp oil lines(did those months ago) after my truck just died going down the road. Seemed like it ran out of fuel or oil pressure. I can get it to start after unplugging the icp while using starting fluid, then I'll plug it back in to read the icp. It reads 850-900 at a cold idle. Oil temp is about 45°F at start up. When it reaches 65-70, it will shudder and die. I'm not able to fire it up right away, has to sit for a few hours to cool. I get rpms while cranking. Icp reads great oil pressure (installed stage 2 hpop and new ipr). Oil level is perfect in the hpop res. I have the blue spring fuel regulator. I have good release pressure when opening the water drain. Filters are good. I did the injector orings thinking I had a leak there.... no change in running performance other than it was a bit quieter now. No oil leaks anywhere. No head plugs or under valve cover oil plugs are leaking. Was told it could be an internal injector blowby issue. Told if the internals are bad or going bad, once it warms up it will allow oil and fuel to blow by and not pressurize in the injectors. Also have read the the exhaust smell will change with bad injectors. I have noticed a few months back that when running in my garage, my eyes will start to burn from the fumes... never did b4 then. Any truth to that? Trying to narrow down an issue other than bad injectors to avoid a bigger cost on top of what I've already spent. Thanks!