1983 mazda rx7 12a all stock dies when put into gear. automatic
 

Bought the car a year ago and everything ran great. Had power and was fun to drive. Filled it up a month later and everything went down hill. It's an automatic but It lost all power. I have replaced the distributor, timed it, cleaned the carburetor, and replaced the fuel filter thinking I had gotten bad gas. It now runs perfect when it's in park. But u put it in gear and it dies like it's lost all power. The only way it moves is if u Rev it to 6 grand n drop it into gear. And even then she only gets enough power to do 15. The only reason I no this is because I had to get it home somehow. Everything is stock. I'll take any advise at this point. For those who comment thank you

Maybe the torque converter is bad. Since it's a 1983, it's an easy swap to go manual trans.