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  1. 2011 - 2014 Mustang GT (S197 - 5th Gen - 5.0L)
    When I start my 2013 GT in the morning, I sometimes hear a loud clunk, knocking type sound from the engine. It happens completely random. Sometimes I don’t hear it for weeks and sometimes it happens for days straight. It ONLY happens in the morning. The RPM’s go up and down while it is doing...
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