I had this exact problem. The last recall, which included replacing the EGR sensor resolved the issue...unless it is the Edge Juice w/Attitude which I also HAD installed prior to the recall...I have not yet re-installed it. I'm hoping it was the EGR sensor that did the trick...not the Edge kit. I'll let you know if it comes back after I re-conenct the Edge. When you brought it in...did they replace the sensor? If not, you might ask them to try that... Also, does it still do it with the Edge removed?