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An ignition coil does one job, but the engine feels it right away when that job fails. It turns low battery voltage into the high-voltage spark each spark plug needs to fire the air-fuel mixture. Most modern European and exotic vehicles use coil-on-plug ignition, with one coil mounted above each spark plug. When one coil gets weak, that cylinder can misfire while the rest of the engine keeps running. An ignition coil should be replaced when testing confirms it can no longer produce a strong, consistent spark for its cylinder. A bad coil can cause a rough idle, shaking at a stop, hesitation on acceleration, poor fuel economy, and a flashing or steady check engine light. Raw fuel smell from the exhaust can also happen when fuel enters the cylinder but does not burn. Boca Raton heat and humidity can make ignition problems show up sooner. Heat stresses the coil winding and insulation, while wet-season storms near Glades Road or US-1 can expose weak electrical connectors to moisture. Short trips, school routes, beach traffic, and I-95 commuting can make a misfire harder to ignore because the engine keeps moving between idle, low speed, and sudden acceleration. Shores Automotive uses scan data, misfire counts, spark testing, and visual checks before recommending a coil. For accurate fault tracing, schedule engine diagnostics and repair before one misfire strains the catalytic converter or leaves the car running poorly. Drivers searching from Highland Beach or Delray Beach for a trusted mechanic in Boca Raton, FL can visit Shores Automotive for careful testing without dealer guesswork. Call (561) 783-4438 today — we will pinpoint the failed coil and get the engine running cleanly