Have a shimmy problem with our 98 Tahoe. Doesn't seem to shimmy all the time comes and goes. First noticed this 3 weeks ago and replace both lower ball joints, seems only 1 was starting to go bad. Two days later shimmy comes back, so we replaced both tie rod ends (inner and outer). Drive it 5 miles without a problem on our way back shimmy starts again. Rotated front tires to back to make sure it's not a bad tire still not the problem. Since we've replaced tie rods and ball joints steering is tighter and not a lot of play in the wheel at all. Upper ball joints seem to be fine have been replaced as well. My question is Idler arm or pitman arm gone bad? Not the typical symptoms of steering play and tire wear although before the lower ball joints and tie rod ends it did like to wander a little. Shimmy seems to involve entire vehicle but seems to come from the front end not for sure what side. Any solutions?