1988 Mazda RX7 auto trans

Have you checked for any vack leaks? Because it can be getting the air it needs but when its in gear it needs more air because its useing more power because of the tran makein it go, if that makes any sence to you. Simple turm drive = more hp needed =more are flow, witch means if its not gitting enuf air flow, then no hp = eng will stall. Lol so look for a hose unpluged or a crack in one the little thing can and will do this to your car. If its not that, then im not sure what to tell u, another q and a would b, dose it go at all like if u give it gas? And then when u let off the gas it stalls?

It will move a little but not much. Ive changed the fluid so I know that there wasnt any cracks in the seal for the trans pan. I havent really tried a pressure test yet. Ill try it an see wht it dose.