dlevitt, obviously the threaded cap/top has loosened and come off each spark plug. Remove the cap from inside each ignition wire boot and either securely attach/tighten one to each existing spark plug, or replace all the spark plugs. As mentioned, each ignition wire boot should "click" onto its respective spark plug for a secure connection. The pliable rubber boot of each ignition wire fits snugly over the spark plug porcelain and won't wiggle loose on its own.

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Fred Hoelzle