03 impreza outback sport won't stop sputtering

[Chrissyb627]

I have an 03 imprezza outback sport that I have been fighting with for the last 2 and a half years. If I need to hit the gas or go up a hill it sputters and hesitates. I have changed the ignition coil several times, the plugs and wires several times, the oxygen sensors several times. I have also replaced the catalytic converter, the fuel filter, the fuel pump and the map sensor. They all provided very short term relief. Does anyone have any other ideas before I push it off a cliff. My mechanic and I are completely at a loss. Thanks in advance