Ford Focus Spark Plug→ http://amzn.to/2eWAQAr
This is an easy car maintenance job that should be done every 30,000 miles. I'm doing this on a 2000 Ford Focus, however, the principles are the same on nearly every car.

Here's a link to a site that helps you ID your spark plug problems:
http://www.ngksparkplugs.com/tech_sup...