99 chevy silverado rough acceleration?

[cody]

ok i have a 99 chevy silverado with a 5.3L v8. when the engine is cold, it has trouble accelerating, it seems to miss out. it idles smoothly, starts fine. after the truck has warmed up, i can accelerate with no problems. i also noticed that occasionaly my rpms will rise by about 200 rpms when cruising. for example if i am going 60 mph and my rpms are 1500 they might rise to 1700 or 1800 for a while. i had the codes pulled and the only one was for a random misfire. i have replaced all coils, wires, plugs, O2 sensors and am about to change the crank position sensor. any help would be greatly appreciated

 

[Tex G]

It seem that the computer is trying smooth it out. You have changed parts that have not repair the real problem. A major turn-up did not help. But good turn up never hurt and give better fuel miles per gallon. A test first would have save you some time. It is called a popping coming out the tail pipe. That will tell if a valve is sticking or a tapped is leaking down and not pumping up to lift the push rod to open the valve.
The second is is a leaking cylinder and not come up to proper PSI. Compression Test would show which cylinder is causing problem. Compressed air into the cylinder coming out the tailpipe is a valve. Likewise air coming out the air horn is a intake valve.
The change in Rpm is showing that the computer is at work to balance out the engine.