Cummins ISX has FSS Derate
I have a 2001 ISX CM 570. It has a stall at full throttle in every gear above 6. I notice it mainly in top gear around 1350-1400 rpm thru 1650 rpm. I did an Insite log to see what was going on. The user fueling state shows both an AFC Derate and a FSS Derate. I think the AFC is due to boost pressure being low(the boost sensor looks like it may be sticking), but I have no idea what causes the FSS Derate. The FSS Derate is the one causing the stall in top gear and the one I'm trying to diagnose and correct.