Three possible solutions:
1 Keep under 65mph
2 balance tires
3 get new tires
A likely first suspect would also be any tire that has been repaired without being re-balanced.
98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both
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