bcaesar

112k. Recently purchased, don't know much of the history, should probably get the timing belt changed.

I have a 2002 impreza 2.5 TS that was purchased at the beginning of this year. Check engine codes have come on and off over the last 9 months and the engine has progressively shown less power over time. I thought it was misfiring, because whenever I put any load on the engine it would chug like it was misfiring. Spark if good, coil pack is good, spark plugs are good. The chugging became worse and worse over time to the point where it would chug even with a small increase in speed or hill, and eventually one day just quit on the road and hasn't been able to start up since, (unless I give it a lot of gas and it was attempt to stay idle erratically). I put injector cleaner in the gas tank while it was still running, no improvement. The fuel pump noise come on when I turn the key to the on position. Where should I go from here? Pull the injectors and replace? Might it be something else? Codes: P0420: catalyst system efficiency below threshold P1507: idle air control system malfunction P0456: Evaporative system leak detected (very small leak)