will not move untill high rpm
 

I have a 92 3.0, AOD I got a few weeks ago. It takes 4 to 5,000 rpm just to get it moving. Once its moving it is ok until I stop again then the same thing. Also max speed is 60 mph and is burning a lot of gas. I was thinking
torque converter or the trans is shot. I would greatly appreciate any help or thoughts. Thanks!!