Missfire

Engine is misfiring at all speeds and loads. It comes and goes but seems to be happing more often. 5.7 V8 with 60k miles, I do get a service engine light (blinking then solid after it smoothes out) and had it serviced at the dealer. At first they replaced wires, cap, rotor and plugs. It went away for a few months then came back. Next time around the replaced two injectors (7&8) and it ran well for almost a year. I've had the injectors cleaned and it made no differance this time around. I am not getting fuel in the oil like you think I would if it was a spark problem. Is it time to do all the injectors and how hard is this to due?

You might try the C/K forum; our trucks do not have a distributor... sorry