Hi Richard,
This sounds strikingly similar to an issue I was battling for a few months, documented in this thread:
My issue was stalling when idling at operating temp, or when changing gears (auto trans). Turning the AC on would usually prevent it from stalling, but it would always bog a little.
My fix was raising the idle a few hundred rpm, but I don’t think that was the root cause, only a masking solution.
Since you have a 94, I believe you should have an OBD2 port.
If so, I would highly recommend purchasing an OBD2 to USB cable (can be found on amazon for pretty cheap) and connecting your car to a laptop so that you can monitor real-time data.
This will give you some more insight as to what exactly could be causing the problem and who knows, might point me towards the root cause of my issue lol.
Please do keep this thread updated with your findings!
-Cristian