I have a 2000 4700 with a dt444 auto in it. Going down the road the truck has a chug chug sound going down the road but you can watch the tach the rpm hand will not move what so ever . The truck sounds like it has a miss in it but it is not missing performance is fine except for every so often when I take off it will blue smoke some & studder a little . I have changed filters & cleaned fuel screen also no codes are present . I am starting to tend to believe it is something to do with the electric accelarator . Anyone had this problem ?