Random shuttoff

[medicsaps]

Truck is a 2006 9900I ISX cm870. I’m having an intermittent problem that is getting worse everyday. Truck looses power briefly but keeps running and the only code I get is by 434. At first it was every month or so but now it’s becoming more frequent. This started after driving down an Air Force range road that was paved washboard type bumps, it shutoff 11 times in 3 miles before I could get my load delivered. When it started it would only happen after driving 100 miles or so. I run the same route most of the time and it would shutoff in the same places. One place is where a 4 lane goes to two 65 mph to 55 mph. Second place is after driving through some Alabama hills and making a rt turn usually about an 1/8 it will cutoff 3-4 times. Now it’s more random places along the route. Certain numbs will cause it and sometimes it’s right turns. When this happens speedometer goes to 0 mph and mileage goes back to last place it was turned off. Here’s a list of things that I have tested and replaced: not in any order
Batteries
Checked battery wires and replaced bad ones.
Replaced key switch
Replaced Ecm
Replaced fuel lift pump (leaking)
Replaced fuel shut off
Replace a timing actuator that was leaking
Replaced throttle position actuator
Load tested “with the old head light bulb test” Ignition wire to Ecm
Load tested every Ecm wire circuit with same head light
Did a fused overlay, with new fuses,for Ecm power and added another fuse overlay to fuel lift pump to ensure it wasn’t grounding or shorting the Ecm power wires.
Removed and cleaned every ground I can find Eng block both firewall connectors and fuse ground inside the truck.
I’m sure there is a few more things I’m missing but please chim in if you have any ideas this thing is about to drive me crazy. Thanks in advance.