2007 Outback 2.5i
I have a 2007 Outback 2.5i Basic manual trans that I recently purchased. Today I was heading up a hill at about 50 mph in 4th gear and the engine suddenly lurched a bit and lost quite a bit of power and the CEL immediately started flashing. I carry around my OBD II scanner in my car so I hooked it up and it shows "P0304 Misfire Cylinder 4." I then drove to the parts store, purchased a new set of plugs and wires and installed them. Upon doing this I discovered quite a bit of oil coating the plug and dripping out of the hole on banks 4, 3, and 1. I figured this oil had fouled the bank 4 plug and I just need to do valve cover gaskets so this stops happening. I did the plugs and wires, cleared the code, and fired it up but bank 4 continues to misfire even after driving it for a while. There's no way the oil has already fouled the plug, especially since I put plenty of electric grease on the plugs. I don't want to cause any engine damage but I also don't want to throw money at it unless I have good reason to believe it will fix the issue. Any ideas about what it could be? Or does anybody know of other things I may be able to test?