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Have you ever checked the plugs after it has shut down to see if you are burning lean or not. Dark, oily plugs are usually means you are burning rich. Whitish gray plugs means you are burning lean. Silver plugs means you have aluminum frags from your piston, not good.

You need a compression guage. it replaces one of the plugs when you crank it over to give high pound reading, then repeat for the other cylinder. I doubt anyone will test it for free, unless you know someone.
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