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A miss or a missfire is when the spark plug does not create a spark or sparks at the wrong time. Causes of a missfire are: worn out spark plugs, bad spark plug gapping, bad or broken spark plug wire(s), worn out distributor cap and or rotor, bad ignition coil, worn gears on the distributor or camshaft, worn out timing chain/belt, for computer controlled engines the coil pack(s), ignition module, cam sensor, knock sensor, oxygen sensor, ecm, throtle position sensor, idle air control valve just to name a few (depends on manufacturer and model).

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13y ago

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