Noise (loud rattle) while idling. Stops while moving.

Hello, it could be an engine noise, it could be an accessory drive noise (something belt driven), it could be an exhaust heat shield making noise. Best to have someone near you have a listen and give you an opinion so you know what direction to take. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops