[B]My 1993 Z28 Camaro all of a sudden started to rock back and forth when ever I am going up an overpass. Sometimes it even rocks when I am going down the street. Is it my throttle body or is it something else. Any information will be appreciated. Thanks

 

a little more info is needed. Do you have a different cam? Could be cam surge if you did. Could be a misfire, could be the coil, could be the opti, it could be about a thousand things. Give some more info on the car, mods, m6 or a4, when it does it (rpm, gear, speed). This will help narrow it down

 

by the way... welcome to the neighborhood