lift both front tires off the ground, then try to turn the wheels back and forth while watching the idler arm. If it moves up and down noticably, that needs to be replaces, watch the pitman arm as well, to see if there is movement there. Use a set of channel locks, and squeeze the tie rod ends where they attach to the steering knuckls and center link. If you can get those to move at all, they need to be replaced. A loose front suspension will cause some pretty nasty bouncing and vibration.
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