Hi, I have an 88 firebird with a 305. All stock and runs, drives, and handles excellent. But recently if I am going very slow and step on the gas and let right off something in the front chatters. It sounds like it's coming from the driveshaft maybe? It's definantly not the motor or a motor mount. Also does not chatter if the car is not initially moving. If annyone can think of what it is it would be appreciated. Thanks

 

Exhaust leak