What causes the steering to wobble when traveling at 55+mph only when you hit a bump when turning to the left? The alignment is also pretty bad and pulls to the left anyway. I've had this happening on my K1500 Blazer LT for nearly a year now. Had it in a shop once but they could not immedialty diagnose the problem at their location and wanted $50 to take it to someone they contract it out to just to find the problem. Needless to say it has not been identified. I suspect either the idler arm or left front shock but am not sure. It has no knock to it as if it were the upper and lower ball joints grinding. Also what is the possible repair cost to this? I've been putting it off for so long because I'm suspecting that someone will try and get me for at least 1K for upper and lower ball joints, shocks and idler arm.