Spark plugs. Why is it so hard?

I can't get the link to work. Can you post the link?
I can't get the link to work. Can you post the link?

I couldn’t get it to work either. But it will take you to the engine labs website. Then under the tech tab you go to the ignition and electronics tab and open that. In there, if you scroll down you can find the article. I’m not sure why the link doesn’t work, but that’s how I found the article.