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OBD code P0304 indicates a misfire in cylinder 4 of your Mazda Miata. To fix this issue, first, check and replace the spark plug and ignition coil for cylinder 4, as these are common culprits. Additionally, inspect the fuel injector and ensure there are no vacuum leaks or issues with the fuel supply. If the problem persists, further diagnostics may be needed to assess the engine's compression or other underlying issues.

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5mo ago

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