Not sure what this means, but I just realized that if I am sitting in my car with the ****er in either position( P, R, N, D, 2, 3) the roughness in the idle that I feel, magnifies x 10 if I turn the steering wheel in either direction. Even if the car is idling smooth and I am stopped, when I turn the wheel the car shakes hard while turning. I lifted the hood and there is fluid, but upon listening to the engine I did notice that I can definitely here a hissing sound. Is there a vacuum line that goes to the power steering? Would this cause rough idling?

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1990 190E 3.0L