Why is my Subaru is showing a PO 304 code 3 weeks after I replaced the coil pack
I have an 2006 Subaru wrx I recently bought the car
from a friend because he bought a new Subaru and
cylinder number 4 had a misfire..I replace the coil
pack everything was running fine for about three
weeks and now it’s reading Cylinder number 4 has
a misfire again .. I’ve checked all the wiring
everything is tight I’m stuck in confused it’s
showing a PO 304 code