ANSWERS: 2
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Crossed plug wires, Bad timing, or running too lean.
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The important thing to look for is slack in the chain. The marks will still line up, but the slack (while engine is warm) can throw the engine off 25 degrees. If the chain had jumped (throwing the marks off) you would probably be asking about a blown head gasket instead of the chain. Take it apart with the engine still warm if you can. There should be absolutely no play in the chain whatsoever yo...
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