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Message: [QUOTE="David Trustrum, post: 155300, member: 21529"] Yeah they have a perforated core in the pipe which might have fallen in, but unlikely as it is a real fight to get it out when you want to. Pull the muffler apart & check the packing is in the right place if it is standard muffler. Only over the perforated tube. Try winding the idle mixture screw in if it gets better off idle it was lean (only off idle), maybe someone adjusted it with a dirty airfilter & the ungungeing of the pipe made it worse. [/QUOTE]