I have a 89 190E model 2.6 with 157K on it. Whenever I step on the gas pedal (around 65 mph and above) the rear end swings left and right for few time and stop, this would not happen when I am driving alone but when there are passengers in the back.
It has Potenzia 205/55ZR15 tires, the rear has regular shock observers with coil spring between lower arm and the frame - No hydraulic or air suspension on this model. Any idea? Thanks