Hi guys so I got a 2004 subaru imreza wrx wagon, and it was running a bit rough and smelt of gasoline due to the loose fuel lines and the tune before running more rich then anything. I got a new tune on it, runs better for sure now less fuel smell but it still has been missfiring in 2-4 sometimes one. I already changed the coils and spark plugs, spark plugs were heavily corroded due to the rich gas that was in it. so that shouldn't be the problem. Where else should I start? Fuel pump has been changed but If anyone has a video or a how to on changing the fuel vent hose I know that still needs to be done as well.