hey im new around these parts i have a 1999 k1500 5.7L and it has been running really rough the past few days and today it threw a trouble code at me that read "random cylinder missfire" and i have just replaced the plugs, cap, rotor, wires, coil. im running out of things to replace. has anyone else had this happen or maybe knows what it could be? p.s. i checked all the connections of the wireset.

 

I have a similar issue in my '96. It stumbles when I accelerrate. If let off and get into the pedal more agressively it clears up. Otherwise the truck runs fine.

 

How many miles do you have on her, try running a few bottles of injector cleaner thru may be as simple as poor fuel delivery