I believe there is a (TSB) for a misfire for the crossfire. Technical Service Bulletin, which involves a computer reflash by the dealer. Your best bet is to take it in with the engine performing the symptoms you've described. If its acting up, drive straight into the service department so they can verify the complaint. If you take the vehicle there & symptoms are not present, they will test drive and try to duplicate the problem but if the vehicle does not act up they have no choice but to give it back to you with an (NPF) test drive (No Problem Found). Chrysler's rules not the dealer. Intermittent symptoms are the biggest problem for dealers because you never know when the problem will re-occur.