95 caddy deville base rear shocks
 

Air-ride control shocks bad. Is there any other cheaper way to replace shocks? HELP!:confused:

rear shocks
 

If yours is like mine. The pump went bad or lines are plugged. I got a kit from advance auto parts for under 20 bucks. It has a t- valve and airlines and orings and airline nuts. Just unkook airlines from shocks( very easy to do) put new lines on shock , the other ends go to the tee valve. I drilled a small hole ( aprox 1/4 inch ) in trunk for tee valve , so its not exposed to elements. Put 20 ponds of air in. Rides great. No codes show up . air level won't work anymore , but that makes the car corner better anyway . I put strutmaster struts on the front also. Better then stock ride if you ask me.

muffler?
 

This may sound stupid but have you checked your exhaust for loose parts. Like muffler , shields or clamps?