[BrushyKing]

when i rev moter to half or full black smokes and misses and has no power. starts and idles fine

 

[Dicion]

See this thread. Exact same issue sounds like:

http://www.powerstroke.org/forum/6-0-motor-problems/218949-6-0-running-bad-then-good.html

Pull EGR Valve, Clean with a toothbrush and your solvent of choice. Careful not to destroy the o-rings more than they already are, wipe down with engine oil, reinstall. See if it makes a difference. If it's too fargone, replace it completely.