I'm getting a little nervous seeing and reading all of this. I've had a cylinder 4 misfire for a while now and changing the plugs didn't do any good. However, the CEL only comes on here and there. I'm assuming that the light would just come on and stay on right? Or wrong? I was going to just change the plugs and see if that does the trick, but now I'm not so sure. These engines are noisy to begin with but I'm starting to wonder if I may have a broken valve spring also...There's only one way to find out. I'll be pulling the valve cover Friday when I get home from a little vacation...but what is the general opinion on my issue? And I do get a lot of backfire...I don't know if that's usual or not. I'm lost...