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Have you ever watched your Mustang's ignition system in the dark with the engine running? Because ignition systems produce 20,000 to 50,000 volts of high-energy electricity, a certain amount escapes ...

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For hot rodders, spark plugs are often nothing more than inspection tools that reveal whether an engine is running too rich, too lean, or just right. Street guys look for a nice tannish-brown tint on ...