Hello everyone! I'm so glad to have found this forum as I just bought a (new to me)used 2010 Cobalt. It's the LT model and I'm having some weird issues. At first when I would drive with the AC on it would cause the car to stall out at some stop lights (i.e the rpms would drop really low and the speedometer would actually jump up tot anywhere between 60 and 100 MPH (the rpms or car would not rev). Then the car proceeds to stall and start right back up. Now it's been a little over two months since I first noticed the issue and with the AC on it will stall every time and even some times with the AC not on. Took it to my local Chevy dealership to run a diagnostics on it to find out the Engine Wiring Harness is shorting out. They gave me a quote of $210 as this isn't covered under the drive train warranty. I'm looking for some help on locating the wring harness to see if this is something I could fix on my own. I've done some research online but don't see much help for this type of car. Any advice would be helpful! Thank you for all the support and for someone putting together this website for beginners like myself!