More than any other vehicle, Ford Triton 5.4 L engines are known for snapping off spark plugs when you try to change them out.
LISLE TOOL (better than the one in this video) - http://amzn.to/2fuE41A
You can try to prevent it by cracking the plugs 1/4 turn, then filling them with your favorite carbon dissolver, but sometimes they still break. This video shows how to use the EverTough 67002 Ford Triton Broken Spark Plug Porcelain and Electrode Removal Set. Be sure to pick up the consumables as well. That is EverTough 67003.
Follow me on social media.
Facebook - http://facebook.com/gregsgaragekc
Twitter - http://twitter.com/steelsplinters
Instagram - http://instagram.com/gregsgaragekc