Diagnosing a misfire

[Mrturner1]

Well I've been chasing a misfire for a week now, and it's really putting a damper on the very limited time I even get to drive the truck in between work. I just changed all the spark plugs, checked valve lash on all valves, checked spark plug wires, checked my timing curve, all looks great, so I'm stumped.

It starts up on the first bump of the key, idles like a champ, but when I put it in gear and accelerate, slow or mildly, I can feel a misfire.