Hey all ive read a bunch on forums and found some info but not a situation quite like mine. I've got a 99 k2500 pickup with the 454. It has a random hard start issue. Sometimes it will crank for a second then backfire through the intake and stall the starter out. Try cranking on it again and it will take 5 to 10 seconds to get it to fire then it will run like it dropped a cylinder for 15 to 60 seconds then it runs fine. It only does this after its been sitting for a long period of time (in the morning, after work). It only does it occasionally, every other day or every couple days. Only once in the morning. All the other times it starts in half a second and runs fine. I replaced plugs, wires, cap, rotor, distributor, upper and lower intake manifold gaskets, fuel pressure regulator, fuel pump, MAP sensor, and ECT sensor about 6k miles ago. Just did the crank sensor. I was wondering if the fuel injectors were leaking if it would cause it to backfire and lock up the starter?