I read s4wiki:
"Finally, if you need to increase your idle RPM and / or idle torque reserve (alters idle timing)
NLLM - idle RPM NFSM - idle RPM while in gear KFMRES - idle torque reserve KFMRESK - idle torque reserve while while transmission decoupled (clutch in) "
That has nothing to do with misfires, that has to do with idle control stability
I increased and decreased the injection time in FKKVS at low revs and loads, to remove misfires at idle.
No, you should be checking your fuel trims to determine the proper fueling, not the presence of misfires.
Please stop just making things up.