Dave26 Posted July 16, 2013 Share Posted July 16, 2013 What do you guys think would be causing a chuffing sound to be coming from my 300, while under load? It sounds like an exhaust manifold gasket has let go but no black marks show, nor do I feel anything blowing out there. She's a '96 with 640,000 miles and has never been apart. Is a compression test and maybe a valve job in my immediate future? Quote Link to comment Share on other sites More sharing options...
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