Had several private body shops and alignment specialists look over the car. They believed the problem to be brake related. We recently had a heavy snowfall which left roads snowcovered and wet. Problem became exponentially worse, pointing to suspension problem. Ordered NEW vertical 2 bolt control arms (Urathane bushings cost $180 for set of 4, 2 control arms with bushings and new balljoints only cost $165). When I removed left control arm, rear bushing center fell to the floor. With new parts car drives like new.
Thanks,
Karl