BAD GAS OR FILTER OR PUMP

What is your question?

ACCELORATE AND ENGINE SLOWS DOWN AND STARTS SPUTTERING TILL I RELEASE THEN EVERTHING IS OK. NOW IF I PUSH IT TO THE FLOOR IT SPUTTERS OUT TILL i LET GO THEN EVERYTHING IS NORMAL. COULD IT BE THE FUEL PUMP THAT IS LOCATED IN THE TANK? OR FILTERS OR WATER?