Hi, My truck is a 1999, 250 , Regulated return @ 68psi,4" Turbo - out ,177,00 miles, DP. Swamp`s has tested compression, buzz test, changed injectors played with moving the cps in till it hit. Dave said that taking oil pressure up helps this engine to smooth out. This miss, is random & at about 2 psi boost. & then it will shudder going up in rpm. I have changed uvc wireing, IDM & all filters. I have talked to some other guys that have had the same problem & you got their trucks to run right & it was the tuner. Is there something I can try too see if it will work? I have a F-6 tuner.
