Engine cutting out/shutting off when the weather is hot

If we run the air conditioner in our vehicle listed above after a short while it will seem as though it is running out of gas driving down the road and will shut off at a stop. Usually will start after a couple tries. Even if you shut the air off, it will shut off at a stop. If you run the air for any time then shut it off because it starts cutting out, will usually run down road okay, but will shut off at a stop.
now that it is hot out if you drive for very long, running errands around town it will start shutting off at a stop, but will run okay down road although it does feel on occasion that it is like almost slowing down a bit even though foot is still on the gas if that makes any sense, that's how I can tell it's going to throw a fit at some point if I keep driving it. But here is the catch: if it shuts off at a stop I can get it started drive to the station put gas in and it will usually be okay. It seems if gas is like a quarter full or below that's when we have the most trouble. But tonight even when it was cool it started jerking/surging I could give it a lot of gas and it would go okay. When I stopped in my driveway let it idle it seemed like it was running out of gas but it was 3/4 full. So first started just with air conditioning or without air if it ran here and there and got real warm and gas was about 1/4 full. Now it has begun to do it with full tank even in evening when its cooled off.