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I'm a first time diesel owner, I have a f-350 2005 6.0L dually. My first problem is when I reach about 40 mph the truck starts to jerking even during acceleration, some times a lot of time when I'm taking off theirs a smoke trail, light bile or gray in color. 2nd problem is my oil presure drops when I'm slowing down to a stop and the check oil light comes on? Can anyone please help?