car sputters

I have a 91' honda civic 1.5L it has a throttle body injection type set up (no individual fuel injectors). when your driving and get to 2nd or 3rd gear it starts to cut in and out sputtering and trowing me back and forth in the car. the problem just started one day out of the blue and I have no clue what is the problemis if it is electrical or mechanical. need help please.........

try a fuel pressure gauge, if your losing fuel pressure itll start to cut out and buck, could be a sign of a bad pump..but this is just one possiblility.