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I don’t think an ‘emission valve’ would care whether a car was in gear or neutral (per claim of not hearing in neutral). It’s dependent on engine operations, right? If the valve is broken and fluttering I would assume you’d hear it in neutral as well, but I could be wrong.
Has anyone been underneath to check it out in the past two years?
My money is on exhaust gaskets or loose hardware/bracket. Could also be a weak component in your driveline assembly.
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