I've been having an issue with my Cruze idling rough when I come up to stop lights. The RPM's dive randomly to the point it nearly stalls (see video below). It doesn't do it at every stop it's completely random regardless of length of time driven. I've taken it to numerous dealership 5 times now and everyone says the same thing if it doesn't post a code we can't fix it (of course it won't do it when they are riding in the car.) Anybody have a suggestion?