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93 Maxima: One of the cylinders is getting spark but with spark wire off, the engine is not showing any rpm difference. With the spark plug wire on or off, that particular cylinder seems to be dead. Symptoms: Rough idle, missing throughout rpm range. Would appreciate info from techs on possible causes and how to narrow down what my particular problem is so that I might repair it myself. Please provide specific details in answers. (Auto Zone does not provide trouble codes on this model car.)Thank you.