Had a mechanic service my muffler while checking on taking off the muffler he realize that one of my engine mounts was damaged he changed one of the engine mounts the one that was over the transmission after changing that one start the hearing a noise from inside engine bay like whenever it's in a low rive or going up hill will be a loud sound so ended up changing all of the engine mount still hear the sound so I'm wondering if it's the engine mounts or the muffler maybe need advice....