noise and rattle on 1997 Ford Thunderbird

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.

by in Panama City, FL on October 25, 2009
2 answers
ANSWER by , October 25, 2009
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.
ANSWER by , July 17, 2010
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.