I have been noticeing the last week that my 6.0l had been stumbling at idle. doesn't matter in gear or park. Idle is not level seems to be jumping up and down 200rpms. When coming up to a stop I can feel the engine stumble also. Works awesome lot of power, egt are fine. turbo boost seems fine also. Then today I come to the stop light truck stumbles and idles down to like 500rpm. Light changes I try to leave nothing on the go pedel. I shut the truck off started it back up and away I go. 2004 6.0L edge juice tuner on #2 always. Automatic trans. 60000miles. Truck starts fine. Cruising at hwy speeds i can feel a slight serge also. Can someone please help.