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you usually can fix that by adjusting the steering box.
There's a nut threaded onto a screw on the steering box. Loosen the nut and turn the screw clockwise. it should tighten up the steering, JUST DONT GO TO FAR, or the steering might stick.
It may be a worn steering box, and an adjustment will temporarily fix it, or it could be you overall suspension needs replacing. Afterall, that car is 30 years old.