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Q: noise and rattle on 1997 Ford Thunderbird

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intermittent fog horn noise from underneath when taking foot off accelerator or while idle at stop light, but as soon as I press on accelerator it stops, Also rattle from under hood when car is barely rolling.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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If your speed slows when taking off it could be the catalytic converters(3). My 96 made the same sort of sound when they went out.
it sounds like it may be one of the exhaust covers maybe one for the exhaust manifold i would also check the covers under the car.
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