Tom,
Pizza guy is right, a better description of what's happening is needed.

I will take a shot in the dark and describe an issue I had with my auto transmission. Once my car was warmed up, under moderate/heavy acceleration the trans would downshift but the car would not pick up speed. The engine was revving and tach increasing to high rpms. I replaced the transmission conductor plate and that solved the problem.

Comparing the new and old plate it seemed to me what I think was the speed sensor on the old plate wobbled around more. I think with the bad speed sensor the transmission did not know what to do once it down shifted. Hopefully this helps you.

I see you are new to the site (welcome). You will receive a lot of help from the members here.