first, be sure there isn't anything caked inside your rims that would throw the wheels out of balance. If they're clean and balanced and you still have the wobble, someone needs to troubleshoot all of your steering components to find out which is wearing out. Could be a balljoint, tie rod end, etc... Def. get it to someone who can inspect all those parts before it gets worse. Most of the time if you catch it soon enough you won't be out a whole lot.
Or, if you don't want to have someone else troubleshoot it and you want to do it, start reading the threads about "death wobble", get something to drink and plan to read for at least 2 hours to fully understand all the parts and how they work together.
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