I’m getting a P0304 Code - Cylinder #4 Misfire code on my 2001 SEL. I’ve seen the various threads on this issue on how to trouble shoot it. However, I’d like to know, how serious is this problem? The only symptom I’ve noticed is that the car occasionally runs rough when idling. Otherwise, the car runs fine. Is this something that needs to be addressed immediately, at risk of ruininng the engine? I do intend to deal with it, I just may not be able to get to it until two weeks or so, but I drive the car 50 miles every day. I’m also aware that I’m using only 5/6 th’s of the engine’s power and probably wasting gas. Thanks.