After driving with a/c on for about 30min I turn the car off for about 30 min. It will not start. It seems like it is out of gas. I have to keep my foot on the gas to get it to turn over, idle & keep running. After driving for a while it starts, idles & runs normally until I run the A/C again.

 

Does your fuel gauge say you are out of gas?

You can try putting gas in to check.