I have a 2005 Cobalt SS 2.0L Its been in the shop for weeks however they cant figure out what is wrong? I bought the car a s a New Left Over in August when it first got cold in October Nove it started Stalling and running real Hard. Been back to the dealer like 10 times and left it here for weeks at a time they cant seem to get the car to do it for them. Does any one have simalar problems of have a clue?