1991 Toyota Corolla 91 toyota corolla

1991 Toyota Corolla 4 cyl Two Wheel Drive Automatic

91 toyota corolla, Well the water pump got busted so the car was overheating after it over heat once the car stared doing like it wasnt getting enough gas so it taked couple of seconds to get normal speed if i let the gas go it would turn off it did it once.. Well i replace the water pump in the proccess i had to take the belts out and a pully so the water pump had more space to come out in the mix i chance the spark plugs and the 4th spark plug had oil i know thats not good so i clean it i also replace the thermostat. Then might is well i change the fuel pump too and i check the fuel filter and it was good it had gas in it. But after replacing the water pump and fuel pump, themostat. spark plugs the car stars good but when it heats up a little bit the car do this thing like it wants to turn off but wen i press the gas it goes away and if i stop pressing the gas the car turns off. can u please help me to solve this problem dont know what else can it be.. thank you for your time..