My jeep has the death wiggle what could i do to stop it everything is tight nothing is crack or bent ?

If you are absolutely sure everything is tight, ball joints, tie rod ends, good bushings, idler arm, pitman arm then you need to get a steering stabilizer. You may even need 2, one on each side. The stabilizer looks like a shock absorber but it fastens to the drag link ( between the tie rods) and to the frame. It can be gotten at most any auto parts store. Hope this helps.