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

 

[2wheeltilt]

How did this turn out?
I was thinking about the only thing I didn’t see was the air filter. Hope it worked out.

 

[Dick Foster]

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

You need to have someone actually diagnose and repair the problem. Shotgunning parts is no way to fix anything.
Those are classic symptoms of a restricted intake or exhaust system. Meaning the engine may be having a hard time breathing. But, as I said that just a clue, not a conclusion.
It could very well turn out to be fuel or spark or even something deeper like bad head sealing perhaps. If in doubt, do a cylinder leakdown check. That can at least help point the way.