CHECK THESE LAST:

11. IMPROPER FRONT WHEEL ALIGNMENT, PARTICULARLY EXCESSIVE CASTER
Have front wheels professionally aligned.

12. CLOGGED OR KINKED POWER STEERING FLUID LINE OR HOSE
Have power steering fluid line or hose professionally repaired.

13. IMPROPER OR CONTAMINATED POWER STEERING FLUID
Have power steering fluid professionally replaced.

14. IMPROPER VEHICLE ALIGNMENT
Have rear wheels professionally aligned.

15. LOOSE, BENT, OR DRY STEERING LINKAGE COMPONENTS
Lubricate steering linkage components (chassis).
Otherwise, have components professionally replaced.