Chevrolet Repair: 1988 5.7 chevy, chevy truck, fuel pump

Question
I HAVE A 1988 CHEVY TRUCK WITH A 5.7 ENGINE THE SERVICE LIGHT HAS STARTED TO COME ON AND STAY ON. THE TRUCK AS STARTED TO ACTED UP AS THOUGH IT WAS FLOODING OUT NOW IT WILL NOT START. IF I HOLD THE PEDDLE ALL THE WAY DOWN THE ENGINE WILL START FOR ABOUT 3 SECONDS AND SHUT OFF, COULD THIS BE A SENCOR SOMEONE SAID MAY BE FAULTY OIL SWITCH, PLEASE HELP

Answer
Hi Ron.... you need to start at the basics... does the fuel pump stay running when it quits... pump should run for 3 seconds... does it have enough fuel pressure...see what codes there are now that you have service light. it should point you in the general direction of the malfuction...hope this helps