Hello I have a 2005 cobalt ls2 coupe with 100k miles my steering wheel shakes bad between 50-75 mph intermittently. Some days not at all and some days it shakes so bad I don't feel safe driving on the highway. It's not the tires/ wheel balancing already replaced and ballenced no change its not the breaks and rotors already replaced and no change. I jacked the car up everything seems ok nothing feels loose. I have had this problem since the car had 50k miles on it but now it's a almost everyday thing and it's really shaking bad. I already had the power steering motor recall done but that didn't change anything. I'm really going crazy and really want it fixed any ideas?! Thank you so much for any help!!!!