Automotive Car Problem?

So I recently got a 97 Z28 camaro for my birthday. And whenever you hard press on the accelerator it makes a loud knock sound and it feels like something Is trying to kick up from under the car. It is by the back right tire. And sometimes I hear rattling sounds from the same location too. Anyone know what's... show more So I recently got a 97 Z28 camaro for my birthday. And whenever you hard press on the accelerator it makes a loud knock sound and it feels like something Is trying to kick up from under the car. It is by the back right tire. And sometimes I hear rattling sounds from the same location too. Anyone know what's wrong? Thanks!
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