Need some input here. Truck has been idling alittle rough for a while. High idle helps alittle. Yesterday coming across Ohio started getting a pretty good vibration under power. ( Driveline is New from the trans back) Got parked and went to idle up and the truck just started shaking. and sounded like it had a miss but no smoke like an injector. Opened the hood and nosed around had Ann shut the truck off and restart it after idling up it would shake. looked to the front and when she shut it down the Damper on the front moved around, in and out 1 time. Started it back up and did it again. I cannot move the damper by hand. It was to cold not to idle so ran the truck all night. Left this morning and got to Hagerstown from Hancock and other then the Vibration under power no power loss, Smoke, or anything else. Any ideas other then a damper going out. Tried calling Antrim diesel today as there hours showed today but no awnser and tried calling Alban Cat. no awnser either. Gonna try both monday and hope for the best. I need to be in Baltimore Wednesday to unload as this machine already has an extention to deliver. Should of been today but the unions reached a 30 day extention and pricks decided since they got that not going to work on Saturday like they where supposed to. thats another story.