Cars, like animals, can communicate with people when something's wrong. Often it’s through a really annoying, odd noise. Sometimes, though, it's a feeling — perhaps a subtle one. But if there’s a worn or unbalanced component, the most sophisticated car rides like a road-going Tilt-A-Whirl. How and when the problem manifests itself helps pinpoint the source. Here are the most common causes of those unsettling sensations.