I notice a vibration when I first start out, but it subsides after a while. It's hard enough to see my hand move on the steering wheel. Since it goes away, I figured that it might just be flat spots in the tires from sitting. Guess my cure would be not to let it sit!

My daughter has an '05 Grand Am that vibrates, more so at high speeds. The dealer replaced a couple tires and a wheel, but it still does it a little.

REDSC400, seems like it might be kind of hard to drive next to someone to see if a wheel is out of since. I guess it's possible, but seems hard to do.