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I know some may want tons of details, understandably, I'll do what I can, but to start, I'll keep it brief (OK, too late, I wrote a lot). History: /6 in 72 Dart sat for about 15 or so years indoors without being started at all apparently. 112k miles. I get it, get it running, convert to...

Changing plugs, pulled out the spark plug tube and wiped around and a little inside the plug hole with the tube out. This thing fell on the floor. Now, I'm not 100% sure it fell out of the hole. Maybe it was sitting near it, or who knows. But. What is it? And is my car going to run better...