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Hey guys, i have a 2001 Mustang V6 5 speed with 112k that has started making a rattle/knocking sound from my passenger side. It does not do it at idle and only once warmed up, if i hit the gas at any gear above say 2000 rpm a loud rattle or knock, not very deep, sounds like a shaking paint can, but loud starts sounding off. I pulled the valve cover off and all the rockers had a little play but all were consistent in their play in regards to the other. they all had oil on them and seemed to perform correctly. There was a miniscule crack on the exhaust manifold that i welded up after replacing the manifold gasket on that side but have not had time to run it. any suggestions? does this sound like detonation? spark knock? bad lifter or valve bent? thanks for the help
 
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