My 99 Buick Century feels like there is something loose under the car on the drivers side?

When I accelerate and when I'm braking it feels like something is wobbling around, under my seat (Under the Car) ? What could this be?My 99 Buick Century feels like there is something loose under the car on the drivers side?could be a number of things. Might be your exhaust system...

Look under the car and see if it is any of your exhaust piping that can move.

Start by the part that sticks out the back (exhaust pipe) and just trace it back to the front and see if any of it moves. a firm grip on various sections of the pipe should tell you if it is still attached. Sometimes brackets or clamps can rust out or come unscrewed. if that's the case, have someone reclamp it with brackets. Hope this helps, good luck!My 99 Buick Century feels like there is something loose under the car on the drivers side?I had a 99 Century %26amp; the plastic wind screen under the front would snag a curb..if you weren't real careful..One time it came partially loose for my wife %26amp; she drove it home. said it made strange noises...Then we traded for an 05..Same thing..have to be careful where you park.. I would think it is something simple..they're pretty well put together.. take a look under..It could be the exhaust system is loosening.My 99 Buick Century feels like there is something loose under the car on the drivers side?if you feel when braking in seat back drums need turning in wheel front rotors need turning or could be tire run out