2004 6.0 Diesel F250 makes shuttering noise when deaccelerate, has been happening for a long time. Used to be Louder when cold & lower RPM. Today Shutter noise is real bad & causing increase boost pressure & high EGT readings! EGT is sometimes high when acceleration as is boost? Can this be EGR valve? Torque converter? Turbo? Super Duty Worried, put over 4000 in truck past 3 weeks. 82,000 mi. This is a shutter noise with a sorta clunk at end. only during deaccelerate. Used to not do this at increased RPM but now it is much worse after last repairs. Please Help, can not trust local dealer.