I have a 96 Chevy van express 1500 it will start when it's cold and you put gas pedal to the floor Once you drive it for two minutes turn it off it will not start

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I have a 1996 Chevy van express 1500 when I got it it was driving perfectly fine you just put the key in ignition and go Now if the vehicle is cold it will start only if you put your foot down on the gas pedal to the floor but after driving it to the gas station to get gas and it's warmed up it will not start easily you have to sit in it for five minutes order to get to start and then it acts like it's flooded when it starts