need help

ok I have a 92 gs, all stock, 5spd. 250,xxx miles drives excellent except for one thing. It gives like this weird rattle or like vibrating bizazzz noise every two seconds while driving. It repeats itself over and over non stop until I completely stop at the stop light it doesnt make that noise unless i take off again it repeats Its coming from the engine bay. And its kinda loud. Any help please

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