need help wont shift into third

yes i posted twice by accident no mix up just when I posted this last I couldnt find it so I reposted. I already took the kickdown linkage off and drove it around the block and nope no shift. yes reverse is good. first and second are fine. it will rev up act like it wants to shift into third but no go. took it on the free way shifted into third but as soon as I got off the free way it started sticking again. it shifted good when I first drove it around the block.

Ok, then I'm not loosin it. :D

That is good info to go on, and it does sound like a sticking valve so the additive may do it.

At what speeds do you get the 1-2 shift with the throttle pressure rod off? (this is kind of important)