My car started to have problems shifting when accelerating fast. As long as you ease into the acceleration no issues as of yet. But when the car its about 2800rmp it shifts up a gear then back down until you let off the pedal and then ease into it. I see it most trying to accelerate say to pass a car or on a hill. I have changed filter and fluid in tranny as well as added a sea form type product for tranny's.