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Engine rattle

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I was driving down the highway about 60 mph the it sounded like a rock hit my windshield. Then a few minutes later, the same sound. Then a few minutes after that, a sound came from the engine like a piece of metal is banging around in a metal container. I don't know if it's a piece of metal that maybe came lose like a heat shield or maybe something inside the engine. You can only hear it when your inside, not outside. Makes the sound either at idle or driving.*