You need to find the problem - a steering stabilizer wont fix that. And it's Kugel IFS

To look at:
- Alignment, especially caster and toe IN
- Loose wheel bearings
- loose tie rod end(s)
- Rack and pinion steering slop or loosely mounted on the frame
- Slop in 'A' arms - bushings or ball joints
- Slop in rear suspension as well as alignment
- Weak coil over springs - what is their inch pound rate vs car weight
- Shocks not working/adjusted, either end.

That's the easy stuff. Others will chime in as well