i have a t56 in my RCSB that was originally a 60E. I have updated everywhere i know in the cutoff, DFCO section, but i still am getting fuel cut at 6400 rpms. Truck falls on its face and wont return to normal unless i turn the ignition off and restart it. pic below shows the log right after it hits. you see AF go 18.0. I'm missing something in the tune somehwere.
on the log, fuel cut is as time ticker 5:15:10'ish. its obvious when it happens bc afr goes from 12.9 to 18.0