I have an 05, 6.0 PSD with 74000 on it and so far have had no issues with it. The other day I took it out to the dunes and ran it pretty good and it did fine. The day after I noticed it started to constantly go between 680 and 730 RPM's (on Banks PDA) at idle or at a stop. This is without lights on or the air on. It runs fine like i mentioned but little things like this bug the hell out of me and was wondering if someone could shed some light on this issue before it turns into something else. Thanks