Steering stabalizer (technically correct term is a steering damper) does not fix steering problems. It is there to prevent them.
A steering damper will not make it track better, reduce steering effort, increase steering effort, fix shimmy, fix death wobble, or make the bronco drive toward a pot of gold. It may mask some symptoms of bad steering parts, but it does not fix them.
The only thing a steering damper should do is minimize sudden steering kickback. Keeps the steering wheel from kicking around in your hands as bad. It dampens impacts in the steering system. Hopefully before they reach the steering box, helps the steering box live a longer and happier life. On pavement you should not be able to tell if there is a damper installed or not (unless you start clipping curbs). Many people remove them completely. Personally I prefer to keep a good one installed because I know how expensive power steering boxes can be and I would rather have mine last as long as possible.
You have other steeing issues. Worn (or sticking) tie rod ends/ball joints, track bar bushings (usually gives a death wobble as well), worn steering box, loose steering box, cracked frame, etc.
