When enough voltage is not delivered to light off the fuel in the combustion chamber at the exact moment of the power stroke, a spark plug can be said to have misfired. It might be a few degrees before top dead center. There could be a variety of reasons for a spark plug to generate a weak spark or even no spark at all. The reasons could be since the spark plug is fouled or wet fouled, too much compression with incorrect plug gap, defective coil, insufficient timing etc. Obviously slight misfires can affect the performance real badly, as no energy is created if the fuel is not lit. Poor drivability, pure fuel economy and severe engine damage are the results of severe misfires.
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