I have a slight steering wheel shake while cruising at speed in a straight line. The suspension and tires are stock and my SC has about 120k miles on it. I've put on new tires, rotated the tires, had the tires balanced, and the shake is still there. It's not bad, but it's very annoying. The steering wheel just shakes left and right at a pretty high frequency. I'm thinking that it is probably a bushing or tie-rod end problem but I was hoping you guys could steer me in the right direction.

 

Well, you didn't mention your alignment; try that first. After that's done and assuming that nothing is bent, then your lower control arm bushings are a likely suspect. They are notorious for being shot by the time they have as many miles as you've got. You might want to have them looked at before you have an alignment done because you'll need to redo it afterwards.