Car starts with push button but shuts down while I still have the button pushed in. Sometimes it takes several tries to keep it started.

Several times when I have tried to start the car it starts, then shuts off with me still having the button pushed in. Several times I have tried to start it over and over again. It starts then shuts off, pushing my seat back as if I'm going to get out.

Ac comes on doesn't blow. Any air