tdang

So my ls430 turns on perfectly fine with no CEL or any lights on. ECT is in normal. When I accelerate it feels like it's not engaged into gear but it is in drive and it just revs as it is in neutral. When it does go it recently feels like up until 3k rpm it's fine but after its just free revving. I got stuck in the middle of the road today and had to turn off the car and turn it back on and it decided to go. My question is if anyone has had or heard of a problem like this? I will be checking the ATF level and resetting the battery tonight after work. Thanks in advanced!