1999 MAZDA MIATA User Comment / Complaint

1999 10th anniversary mazda miata currently with 33,900 miles on it. about 600 miles ago car suddenly started and ran rough with check engine light on. had code checked and revealed p0300 (random misfire i.e.ignition coil pack failure). check engine light went out after reading code. symptom reappeared recently with same code p0300. replaced spark plug wires with ngk oem wires about a week ago and symptom reappeared this afternoon. i understood this is not covered by the emission control warranty but the subsequent catalytic converter failure is covered under the 8/80.000 emission warranty. if the catalytic converter is subsequently caused by the failure of ignition coil then why is the ignition coil not covered under the emission warranty. this is another bureaucratic snafu. the cause of the emission failure is not covered under the emission control warranty. so maybe i should wait until the catalytic converter failed and have mazda (ford) replace the catalytic converter and then replace the ignition coil pack then because it will cost me the same but over $1000 for mazda (ford).