car turns over but wont start on 1998 Buick Regal

the car was sputtering a little but then started to run fine went into store and car wouldn't start acted like i was out of gas got three gallonns of gas so could make it to gas station tried to start car and it only fired ounce and smelt like rotten eggs not sure if it is bad fuel or gas lines

Asked by for the 1998 Buick Regal