I have a post about getting the P2002 error and a additionally a problem with Bump/Jump/Clunk, When I remove my foot from the brake from a stop, but I was wondering if you guys get much soot on the back of your car? In looking for the problems with the emmission system maybe that is a red flag. Thinking back, I have had soot periodically in that area of my car, maybe that is another hint of the problem? Is it normal for your Cruze??