Not Ranked
1. A plug wire could have been partially unplugged from the cap/spark plug and you became the new ground when you touched it.
2. The cap may have a crack in it .... and again you became the new ground.
3. (most likely) The plug wires are shot, full of resistance. You body now has less resistance than the wires and once again, you were the new ground.
Dave
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Too many toys?? never!
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