Automatic Chrysler Neon Transmission 97

Good friends of mechanics manuals that such. I need some help with my neon of 97, I am new to mechanics ... The issue is that the automatic transmission of the vehicle is working badly, when the vehicle is cold and I try to go back does not fall the setback and I must accelerate it several times until I fall, I have also noticed that when I am starting the first speed it works well the second takes a little but it falls for the third it takes even more and the revolutions increase greatly. After the vehicle is hot, it fully works "well" the setback grabs it

immediate I roll at least about 8 km, what could I know?

Thanks I await a prompt response