Hello there guys. i have a quick questions about an automatic transmission and i wanted to know if am on the right path as i have never worked with auto transmissions. i drove my girls celica and every time i shift into D it takes like 2 0r 3 secs to engage. also sometimes when you accelerate it feels and sounds as if its not engaging sort of like when the clutch is out and the you driving and floor it but the car dont move but the RPM go up. i am thinking that it is the transmission fluid that needs to be change. it has 96k miles and she is the first owner of the car. the fluid has never been changed everything else is been on schedulle. what do you guys think it is. i will change the fluid next week. is my diagnostic accurate?? thanks in advance