Hello, I have a 99 f250 .. 7.3 ... I haven't had the truck long so I don't know much of its history ... 3 weeks after I bought it it started spitting and sputtering rough idle smoking white ... did temp check on cylinders 2 where low temperature. .. also had glow plug codes bank 1 and 2 ... repacked two injectors for cold cylinders. .. just replaced uvc harnesses and the smoke is gone but still rough now has p0237 code along with glow plug codes p1396 and p1395 ... truck has around 304k on it drove awesome at first then this happened ... some one please help!!!!