Make sure you are not pulling the cable too far at WOT. They can get stuck. There is a passageway in the valve body that actuates the "kick down" and maybe you have some dirt in there. I'm thinking it could be a governer issue. At WOT what is your upshift point? Should be at least 4000+ RPM. When all else fails maybe stop by the tranny shop, those guys will normally give out a little free advice. Godd luck.
Dave
