Chevrolet Repair: hey, chevy silverado, throttle body injection

Question
i have a 1988 chevy silverado 1500 5.7L when cranking fills up carburator with gas

Answer
HI VIRGIL,THIS TRUCK SHOULD HAVE A TBI UNIT [THROTTLE BODY INJECTION..LOOKS LIKE A CARBURETOR BUT IS NOT..ON TOP OF THE THROTTLE BODY THERE SHOULD BE 2 INJECTORS WITRH WIRE HARNESSES GOING TO THEM..3 THINGS CAN CAUSE WHAT IS GOING ON.
1. A BAD COOLANT TEMP SENSOR,THE SENSOR THINKS IT IS COLD OUT AND ALLOWS ALL KINDS OF FUEL IN.
2. A BAD PCM [POWER CONTROL MODULE COMPUTER]OR BAD WIRING HARNESS SHORTED OR OPEN TO OR FROM THE PCM.
3.BEING THE MOST COMMON A INJ THAT IS NOT SEALING OFF THE FUEL,,TO TEST THIS REMOVE THE WIRE HARNESS ON TOP OF THE INJ.[SHOULD HAVE 2].CRANK THE ENG OVER AND SEE IF THE FUEL STOPS..IF THE FUEL STOPS THE INJ IS OK, BUT IT IS RECEIVING A SIGNAL TO HOLD IT OPEN FROM #1 OR 2 ABOVE. BUT LETS SAY THE FUEL STILL IS POURING IN WHEN THE INJ IS UNPLUGGED NOW WE KNOW THE INJ IS NOT SEATING..TIME FOR A NEW INJ..THERE WILL ALWAYS BE FUEL UP TO THE INJ'S BUT CAN NOT OPEN UNTILL TOLD TO DO SO OR IT IS LEAKING....LET ME KNOW HOW YOU MAKE OUT AND GOOD LUCK TO YOU,,,TOM PLEASE RATE MY ANSWER WHEN YOU LEAVE THIS SITE..THANK YOU !!!!