Shakes or Wobbles problem
1993 Buick Lesabre 6 cyl Front Wheel Drive Automatic 183000 miles
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As I increase speed, the front-end wobbles and a speed related rumble becomes louder - I can feel it in the sterring wheel and hear it. However, when I turn slightly, the rumble and wobble go away until I straighten the wheel and they return. Where do I look for the problem? Thanks

Check the wheelbearings first for play. Run it up in the air on a lift and listen to the bearings with a stethescope.