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Buy the UPDATED one-piece OEM Motorcraft spark plugs (pack of 8) here: https://amzn.to/3maBgWF
Get the Seafoam here: https://amzn.to/3s5SoAN
How to clean the throttle body: https://www.youtube.com/watch?v=_uN62jOj26E
Complete step-by-step guide on how to replace your Ford 5.4's spark plugs, along with some techniques that I use to help avoid the problem of spark plug breakage.