Lly duramax
Intermittent issue with my truck 220000 miles. I’m getting codes p0202 P0203 p0205 p0208 p1249. Will drive fine for 20 30 40 miles with no issue then all of the sudden run rough. Sounds like a tractor. Can sometime shut the truck off for 20 minutes and it runs fine again. When it acts up there is no power and shuts the whole bank off. Gas gauge goes to empty. I’ve replaced an iffy injector, all injector pigtails, in tank sending unit, fuel filter, fuel filter housing, and cleaned all five grounds. My next guess was ficm but I’m looking for suggestions before i spend another 1500 on one of those.