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Message: <blockquote data-quote="Max Trax" data-source="post: 981482" data-attributes="member: 54888">L1tech,The noise sounds more like a rattle like marbles in a jar being shaken than a clunking.  As I understand it, this can ruin an engine, which can set off all sorts of check engine codes.  I am guessing that's the source of the misfiring.  Once, we've corrected the rattle by replacing rear timing chain tensioner and replaced the valve cover gasket along with the tune up, we're guessing that should fix the problems.  As for the oil leak, I will put that off and see if the above repairs are sufficient.</blockquote>