I was just wondering if anyone knows what might be wrong with my WRX. I get a P304 missfire code on most warm starts, usually when I get gas, but it would always go away after a few drives. I couldn’t feel a missfire but sometimes it feels like it is idling slightly rough but I’m not sure, but as soon as I start driving it is completely smooth. The car also uncommonly has a hard time starting like it is turning over but doesn’t ignite for a few seconds, usually on cold starts. I changed my spark plugs recently, and it seemed like these symptoms got worse after, but would still happen occasionally before. Thanks in advance!