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Rumbling while idling

My best guess is an exhaust leak. Have you inspected your exhaust system? Could be a pinhole leak or a loose fitting. Do you have an aftermarket exhaust system or is it stock?
 
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My best guess is an exhaust leak. Have you inspected your exhaust system? Could be a pinhole leak or a loose fitting. Do you have an aftermarket exhaust system or is it stock?
Just got the truck last week and they legally have to put up to date inspection and no it’s all stock. At times it’s more noticeable than others which is weird
 
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