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The Neon is *very* sensitive to wheel balance. Have your wheels rebalanced to the nearest 1/8 ouce instead of 1/4 ounce, and make sure the machine has been calibrated recently.
Make sure that your tire pressures are even between the two front tires.
If you have aftermarket wheels, remove the sheet metal retaining washers that are located over one wheel stud on each hub. These are used for assembly purposes only and are not required. Unlike the factory alloys, some aftermarket wheels do not have a small depression in the mating surfaces of the wheel, which provides clearance for this retainer. If so, the wheels can be off axis with the spindle, causing fluctuating toe in/out with each revolution.
If you have aftermarket wheels, get hubcentric rings to ensure that the wheel is truly centered on the spindle. Many aftermarket wheels have wider tolerance on both the stud holes and the center bore to allow fitting on multiple vehicles. If the wheel is not perfectly centered it will shake as each revolution is slightly eccentric.
Hope this helps you!
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