1800ES Engine Mystery

Yesterday while my 1800es was at idle there was a loud mettalic “ping” from under the hood, and the engine started clattering and running as if it had swallowed a valve. I removed the valve cover to look for the guilty part, but they were all in place. Afterward I could only get the engine restated by spraying a little ether into each cylinder. Here’s the dilemma  now, without any additional repair or adjustment from me it starts and run’s like its never had a bad day in it’s life. Any insight to this “Christine” like behavior would be greatly appreciated.

B20 engine self repair

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