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It does it when im going streight down the highway

hello fellow tahoe owners. I have a 98 tahoe 4wd 5.7 and when im driving sometimes it makes this wierd bump but i have no clue what it could be. It may only do it once or it has done it 3 to 4 times in a row. It is almost like the abs is ingaging for just a second. Does anyone have any ideas...