Stalls in Gear, Automatic- Restarts Good- Can Slam it into Gear! EEEK

He never really was clear as to weather it will idle after its in gear, but sort of sounds like the torque converter if I am reading all this correctly.
it will not idle once in gear. I can only get it in gear if I rev the **** out of it like 2000 plus rpms then it will slam into gear and stay running at the rpm but I dare not keep it more than a few seconds because it useless to continue anyway. any other way it stalls immedialty.