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The most common cause for this condition would be faulty tune up components. Any secondary ignition component can go bad causing the engine to misfire intermittantly and may not even light the check engine light dpeneding on the circumstances. Also, Interference can get into the Crankshaft Position Sensor from a poorly grounded block or a charging system problem so be sure to check the alternator, battery, engine and frame grounds. Last but not least, some other possible causes would be a bad oxygen sensor or mass air flow sensor.