Silverado 2500 6.6 duramax
Bought this truck 2 weeks ago, ran perfect. Code P0087 popped up for fuel rail/system - too low. I dropped the performance level on the tuner(mini maxx). After that it would crank but not fire. After a while it would crank crank crank then fire up running rough. I replaced fuel filter and head assembly. Primed it and started it right up. After a few days of driving it wont start at all. I tried priming the bowl and bleeding the fuel lines but still nothing. Any thoughts on what the problem might be?