How you find out what or how to diagnostic on my engine stalls on turn,hard stop

What is your question?

When makes turns and hard stop also having hard time shifting gear, and sometime skip gear when stalls and stay lock on that gear until you pull over to the side or park it and cut off the engine. Then start the car back up and take off the car seem to be running good until you turn or make stop. Can someone help me fix the problem thank a lot to who can help me fix my wife car.