im getting a vibation about 55-70 mph ive eliminted the drivetrain as a problem and found out it hs a code or the EGR valve s this hard to change and could this be my vibration-miss problem .
EGR valve on 2005 Ford F-350 Super Duty
The EGR valves generally are time-consuming to clean and/or replace. It's possible that a part of your emission control system is causing a driveability problem. It could also be related to wheel balance and alignment. Have you eliminated that possibility?