Hey all. 98 GMC Z71 Sirerra Ext Cab 4x4 here. I am finding on ocassion, when driving straight or going in a curve on a road, whether my steering wheel is turned to the left, right, or motioning for correctness, my steering wheel will, for lack of better words, twitch and feel as if I put a large amount of steering input into it, when all I really did was move the wheel 1/2 in. Its a surprise when it happens. Any ideas?