Still having troubles with my 2009 Challenger SRT 8. I thought it was fixed but no. Miss fire on # 8 cylinder continues. Sometimes just a missfire code P0300. New battery, coil pack, plugs , Injector on that cylinder. Sometimes car will shut off at a stop light. I only has 22k miles on it and been pampered. Best solution for ECM replacement? Does someone have to tune it?