This could the the coil breaking down, or it could be a bad earth. The coil converts the 12v car battery voltage into a voltage capable of jumping across the gap of a spark plug, in excess of 12,000 volts.
This could be breaking down such that it is unable to provide the continuous voltage required. Are the two spark plugs always the same? If so, what happens if you move them to a position which doesn't spark.
Also, the spark plug will only work if there's a good ground between the plug and the engine block. Oil, dirt and possibly rust will effect the plugs ability to create a spark. Again if you move a 'good' plug to a position which doesn't spark, depending upon the outcome, will point you to the problem.
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