Late OBD1 HFM-SFI have individual ignition misfire code storage.
These are 16 pin diagnostic connector pin 8 access and are both HHT readout and flash code.
Flash will retrieve each coil secondary output/misfire only,
[ codes 21,22,23 for T-1,2 and 3] ,
However, same access pin with HHT will specify each plug firing and secondary coil out ..codes 055 thru 063.
This is only on pre OBD2 HFM only ..and this module does not trip the CE .
[ although, if the skip/coils output persist long enough, the info does get back to the DM and fault a CE as a non-specific Ignition detected fault....