The plug ends under the coils (three on HFM motors) will NOT set a code on a non OBDII car.
Any detected misfire will trigger fuel shut off on the offending cylinder. Restarting will reset the fuel untill another misfire is recognised. So a recognised misfire will perpetuiate itself. Not all misefires will be recognised so some can be felt and go away. Once they are recognized they stay until the key is cycled.
Bosch Master, ASE Master, L1
33 years MB technician