1973 Questions for all other cars Firing problem

1973 ALL OTHER MAKES ALL OTHER MODELS
72,000 MILES • 4 CYL • FWD • MANUAL
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MY100441
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Why would a spark plug begin to misfire when the plug lead is fully inserted onto the plug. If the lead is held away from the plug, so that the spark can be seen, the plug fires normally. Once the lead is connected as it should be, the plug stops firing.
Feb 10, 2008 at 11:36 PM
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MIKE H R
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It could be a cracked electrode inside the plug making it so it shorts out.
May 15, 2008 at 10:36 AM