I have a 2003 Chevy Malibu, I started to hear a rattaling sound when I drive.?

[jbayard15]

The sound stops when I brake and kinda goes away when I hit the gas, but when the car is moving and I have my foot off the gas and brake that's when the sound is the worse. Anyone have any idea what may be wrong? Thanks

[Gabriel]

I bet it's your catalytic converter. They rattle when they go bad. If you're under 80,000 miles it will be covered under federally mandated warranty on exhausts in the US.