Engine runs fine and car can reverse but has no power in drive.

Hi all, I am not much of a car guy and I am having an interesting situation with my old 2001 saturn l200 that has auto transmission and 140000 miles on it. It was working just fine till this morning when waiting at a stop light the light turns green and I start pressing the gas it just sat there and revved the engine but no power going to tires. I had to push the car to the side of the road. I shut off the car and waited maybe 5 minutes and then started back up, again started fine engine not sputtering and when I shifted into drive it started to go but was getting hardly any acceleration even though I was revving up to 3 to 4000 rpm. I know it isn't the catalytic converter cause the person who had the car before me apparently removed it. I also tried putting the car through all the gears but in any forward driving gear it just has no acceleration. It almost acts like it is stuck in a higher gear for no reason. It works in reverse fine and I have run the code scanner but it is coming up with no codes. The engine light is on now when it wasn't before today.

I found out that my car is leaking transmission fluid and that I somehow cracked my transmission fluid pan. I was using an OBD2 scanner and it was attempting to read the codes and was coming back with no codes, not an error. Also took it to autozone and had them scan as well and they got no codes either. I have ordered a new pan and filter and gasket for the car and am waiting on them to come in.

Like I stated I am not very good with repairing cars but any help would be appreciated.