If your Mazda Miata has starting running very poorly, or stopped running entirely while showing symptoms of lacking spark, your Mazda Miata ignition coil is most likely the cause.
Any time the Mazda Miata ignition wires exhibits physical damage either to the ignition wire or the boots, the Mazda Miata spark plug wires should be replaced as preventative maintenance.
Mazda Miata Copper and Platinum Spark Plugs by Bosch, Denso and NGK. Replace the Mazda Miata spark plugs once a year for optimum vehicle performance and increased fuel mileage.