2013 freightliner cascadia dd13

I've got a problem I'm working on here
I've got this truck that will idle fine etc start out on the road and it acts like you took your foot off the pedal. Rpms drop down to idle then it will come back here last couple of days you cant even drive it. Before it was real intermittent. I replaced the pndb module today didn't help I've got a code that comes back to the qaunity control valve I'm trying to remember what it was but I'll post it in a minute. I know the qaunity valve will mess the idle up but not sure if it will do this. Any help would be greatly appreciated

 

Spn 520250 fmi 4

 

The instrument cluster dosen't lose power it's just the accelerator

 

Yes I've thought about that. Do they go bad and not show a code. I'm almost leaning towards the mcm after doing some troubleshooting but not positive yet.