Hi i am having the exact same problem the smell the cracked coils everything, did you ever figure it out??I know what you are talking about, the coil pack is burnt on the side of the coil, it's cracked and burnt and cooked, probably smells like an electrical fire. These guys that are trying to help you by saying " I have never heard of a coil pack burning up, it's your spark plugs" or what ever they are saying just shows they are not technicians and probably shotgun parts at cars and hope they fixed it. I have a 2014 Cruze in my shop right now for the exact same problem. We have not figured it out yet but as soon as we do I will post the fix for you and hopefully that will helps.