The engine in my 81' 300SD is shaking side to side more of an oscillation.

I got it to stop by turning the Alda 1 turn counter clockwise. It ran smooth but the car used excessive fuel. I turned it back to where it was and the oscillating continues. I have replaced the rack dampener bolt with the gold one and adjusted. It still sways side to side. Turning on the A/C smooths it out also. RPM's are set at 700.

Any suggestions on what to check or search for ?

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