is this a tranny problem?
 

why at 4,000 rpm does my 7 nose over then increase speed slowly?

I doubt it, I responded on you're other thread titled "rotary's" ( https://www.rx7club.com/2nd-generation-specific-1986-1992-17/rotarys-424614/ )

Its commonly around here refered to the "3800 hesitation" mostly due to fautly grounds, again if you do a search you would find more then enough info on this.

Just a word from being around here too much like I have: If you make multiple posts about one subject the admins will not like it. ;)