Poor rear axle stability

This is most commonly worn shocks/struts, but can also be tires, alignment, worn bushings, worn sway bar end links, basically worn suspension components in the rear OR the front. It is best to have a professional inspect the issue and make their recommendation. Here is a link below to some trusted shops in your area: http://repairpal.com/kia-within-10-miles-of-mission-texas-78573