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I have 97 4-door civic and recently while driving on the interstate the steering wheel began to shake violently. It stopped after awhile and now shakes a lower speed, but less intense. (vibration seems to be a function of tire speed). Two different shops could not even detect vibration (does not happen all the time) I do know that one wheel bearing is getting bad and brake rotors are warped (no vibration when braking though). Does wheel bearing make sense? Anyone else have this problem?

 
Rep Power: 217

Wheel balance? Outer tie rod ends? Those 2 things come to mind. The latter is pretty easy to check. Loosen the wheel lugs. Jack the car up, put it on stands. Take the lugs off and the 2 front tires. Move the outer TREs like you would rev a motorcycle. If there's any play, they're shot and need to be replaced.