I have a 2005 Impreza RS Manual Transmission, ~40,000 Miles.
During a rain storm 2 weeks ago, the car was running rough and misfiring. I brought it in and 3 of the cylinders were misfiring and they said the oil was extremely low.
They suggested a new coil and new wires for $900. My mechanic from where I lived previously had replaced the coil 6 months previous (when it was cracked).
I decided to replace the ignition wires, spark plugs, top off the oil, and reset the check engine light but leave the coil for now since it's brand new.
A week later the car was running OK, and the check engine light came on again. Brought it in- code was catalytic converter. The dealer said there could be some unburnt fuel from misfiring and reset the codes.
Yesterday, the check engine comes on again- and it comes up as catalytic converter. Right now it is running quite rough and idling at about 200-500 rpms.
My previous dealer replaced both the catalytic converter and at least 1 O2 sensor 2-3 years ago.
Where do I go from here? Any ideas on the rough running and recurring symptoms/ codes? My last thought- I bought some really bad gasoline the other day from 7-11 (bottom of the tank).