I bought an 03 SS this summer. Living in northern MN we have some less than good winter road conditions. After having driven this on some slippery roads as of late I have to characterize it as being "squirrely". I don't feel like there is much feedback from the road and when ever an slick spot is encountered I get the feeling that things are about out of control. Have never had this with any other vehicle. Do you think this is attributable to the posi, AWD or a tire issue (Goodyear something or others, 30% left.)?