1993 Chevy Beretta CarStalling

Hi I have pretty much tried everything on my car. The issue is that sometimes the car stalls but only when the car is in gear if it is in neutral or park the car idles and accelerates normally. But once I put into gear it hesitates on acceleration then dies. The weird part is that it only does this sometimes. One day I get in and it works perfect then the next thing I know it stalls and hesitates on acceleration. So I have done the folowing I changed sparkplug wires, fuel filter, checked for engine codes none no light on, checked fuel pressurre it was at 40-45psi which is fine, the tcc solenoid is already unplugged, (i keep reading on forums that in this situation thats the thing to do is unplug it but its already unplugged) checked all vacum line ok, checked ignition module ok, took it to a shop they cant find out whats wrong, But when it works you accel and it does it normal if you slam gas it speed up normal. Sometimes it doesnt always stall it hesitates and hesitates then it like recovers and starts accelerating fine. The thing is I cannot trust car cause one day it will run fine then the next it stalls all day. But lately it does it almost all the time weather car is cold or at regular temp. Any suggestions on what problem could be I would really appreciate it thanks in advance. PS They also checked fuel injectors and they said they are fine. Gabe