CEL p0301b-p0302-p0303-p0304b-help
 

The cel light came on a month ago with these codes (02 wrx wagon 5sp). Even though I had the spark plugs changes 9k miles ago (60k service), the mechanic suggested to change them again. I did and now the cel light is back on with these codes listed again-misfire on all 4. Any advice would help because I can't afford to just start repacing everything to see if that fixes it. I might just have to bite the bullet and take it to the subura dealer.