First, try swapping the tires from side to side to see if that helps. Check the caster from side to side. The caster may be within spec on each side, but the total caster or "cross caster" can cause the vehicle to pull. Also, check the condition to the pitman and idler arm bushings on this model. Deflection can cause changes in toe while the vehicle is moving.
Editor/ASE Certified Automotive Technician
Editor, Brake & Front End magazine