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Question: Steering control loss

When I am driving and it doesn't seem to matter if I am at 25 or 70 I will randomly lose control and it pulls hard left ot right. It feels like I am driving on ice..like there is very little control in the steering at all. almost too loose. It makes it look like I am steering left and right quickly at times just controlling it when it does "act up". Sometimes it is just fine and drives great. Tires are ok on front and just had rear tires put on this morning. The steering is actually worse since I had the tires out on today. Twice when I got to 60 (10 miles under speed limit) it started shaking and sounding like something was hitting. But if I slowed a little it didnt make the noise. (It didnt do that before today) I thought it was alignment but it is so all over the road that I am not sure about that. It is almost like someone is squirting oil underthe tires while I am driving! :) Thanks!