[RemoteFX]

Spark plug leads are notorious to go on these cars, i got a spare set when diagnosing a misfire. Check if they have continuity with a multimeter or just get a spare set of ebay like me.

Welcome to the mx5 club My dad drove my nb for 300 miles without any issue (other than a broken o2 sensor that was known when i bought the car), i got insured and immediately had electrical issues )

 

[RemoteFX]

Try reusing the old leads if the issue magically comes back then you found the physically broken part & can trust your new fix.

Congrats either way and get out to enjoy the car!