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Rough idle, no power- out of options
I've got a 2003 7.3 that I've been trying to troubleshoot for a week now. I don't have a code scanner so I'm struggling. I'm about to the point to pull it to the shop. Sorry for the lengthy post.
It has a rough idle and very little power. Can't get it up to speed and shakes and vibrates while trying. After running it for 20-30 mins it begins running even harder and will die out completely. Won't start back for 30+ mins. According to the temp gun it's not firing on 1,3,4,5 cylinders (temp on these at exhaust much lower).
What I've done thus far:
I suspected UVCH issue on the passenger side. Removed VC and harness was disconnected a little but not as much as I had hoped. Disconnected and inspected and all looked normal. Nothing burnt. Reconnected. No change.
Pulled connector harness at IDM and ohm each injector. Each injector ohm at 2.3 with no variation between each bank. This was done with harness at VC connected and testing all the way to the injectors for resistance.
Replaced CPS. No changed.
Pulled ICP while running. No change. It did have oil on the harness and may need to be replaced but several suggested leaving it disconnected while running to see if issue clears up. Mine showed no change while disconnected and running.
Ohm each of the GPs from outside VC harness. Driver bank all showed around 1.8 while passenger bank all showed 4.1.
No smoke while idling. Small amount of blue while struggling to gain speed or under load but not a lot.
New fuel filter was installed a few weeks ago.
Any ideas on anything else to try? Could I have a IDM going bad? It's a pricy item to buy just to "test" with but I don't know any way to test it.
Thanks for any advice you can provide.