I ran a cylinder contribution test this morning and these codes came up. truck was fully warmed up. Not sure how serious it is, I dont know anything about injectors. Im changing the oil right now. I had about 4k on Rotella 5-40 and now im aswitching to Delo 15-40. I though I read somewhere that the condition of your oil has alot to do with these types of things, hoping its just that!!