I have a 2010 GMC Acadia with 179000 miles. The problem I am having is when I start my car the traction control light comes on then the stabilitrak services pop up and that even before I put it in drive. When I put it in reverse, it shift real hard that the car shake. When I put it in drive and press the gas, it's like it's going no where. If I get up to 40 mph, the dash start to go up and down and then it go limp. Please can someone help? Been to the dealer and they charged me for something I didnt need. Now they say they can't continue cuz I'm not under warranty.