99 GT Auto Trans Problem

[hawks05]

alright the car is at about 64000miles when im driving the car seems like it downshifts and the rpms sit a little higher than they need to be. after sitting high for a little bit it shifts back. i tried cleaning the IAC so not sure that its the problems or not. any help would be great.

[1234]

Has it ever had the fluid and filter changed?

[hawks05]

that i dont know.