Hello everyone, i own a 2006 impreza 118kw 2.0l.

Recently it has been misfiring(i think) when under load and idling rough.

As for misfire i press on the gass and the car starts jerking as if downshifting.


I hooked up my obd scanner and i got P0172 code for a rich system and my short term and long term trims are in - 25% range.

O2 sensor seens to be working fine (jumps from 0.1 to 1 volts constantly).

Second o2 sensor is showing around 2.1v on idle.

Maf sensor shows 6.5g/s which i think is little high so my idea is to get some maf cleaner and clean the sensor.

One mechanic said it might be spark wires since i have changed spark plugs half a year ago and had no problems after the change. How can i diagnose if its wires or air intake problem or something else?

All the tips are appreciated.

I will be getting edm sensor in the next two weeks so i will be able to get some graphs together since i tried connecting my obd to scanmaster and it said it cant find it.