I have an 03 and had the ECM change done in October. since then, it idles at 1300 RPM, doesn't have the power it had, and the gas mileage has dropped. Tail pipes are now sooty, whereas before they were clean. It is definitely running richer than before. Has anyone else experienced this? If so, what did you do to correct it? I have no confidence in my dealer's service dept and would rather not return there. Any help would be appreciated.
Jack
Jack