Im having drivability issues with my 97 2.2 impreza outback, i have a bogging down after acceleration without moving my gas pedal, i replaced these parts as following; idle air control valve, MAF, coolant temp sensor, plugs, wires, ignition coil pack, neutral safety switch and the fuel pressure regulator. After replacing all of this i have 3 misfire codes in cylinders 1, 2, and 3. When watching the live data the long term fuel trim and short term fuel trim the numbers start at zero, when the bogging happens both go to negatives and will drop to -30 or so... Can anyone help point me in a better direction?

Does engine temp make any difference? Cold vs warm?

 

Does engine speed make any difference?

 

What kind of plugs and what brand of wires did you use?

The 2.2 is generally not to picky about wires as long as they're decent quality. Plugs should be standard copper.

lazy front O2 sensor?