Tahoe shimmies at 45-50mph why??

I have a 96 Tahoe, when i hit a small bump at around 45mph i'll get a bad shimmy, does not do it all the time but i want it fixed.
Any idea what i should check first? Thanks for any suggestions Steve in Ct
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Could be loose tie rod. Or idler arm etc. either way a thorough front end inspection is in order. Larry

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