this is the problem:

I was driving it at about 50-60 mph on an up hill, and all of a sadden didn't want to go any more. I steped on the gas, and no responce. So i had to pull over and checke around and there was transmision oil all over the ground. I called a tow truck and took it home, then at home i filled the trany oil level back up and now i can drive it around town. But now, every time i go about 45 mph the rpms start going up and down and i have to accelerate to fix the idleling and it goes away. But that happens every day and i'm affraid to take it out of town.
Has any body experience any thing like that? Thank you in advance for all your help.