1988 Chevy S-10 stalling

When the engine is at normal operating tempreture and the outside air tempreture is high and the streets are hot and I have less than a quater of a tank of gas, the engine will stall as though I've run out of gas. You can put it in neutral, turn off the ignition and restart it as though nothing is wrong. Once this happens it happens moe and more frequantly. It can happen sitting at a stop or if I take my foot off the gas pedal. Thanks for the help. Walt