Uploaded June 2025 | Updated September 2026, 1 week ago

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Spark plugs! They are the number one source of misfires at wide open throttle on most of the cars we tune and we go over this with customers all the time!

Fresh spark plugs are great but the gap must be correctly set especially if running a tune and more boost.

Here’s how to check and gap your plugs - on our Focus RS!

Want plugs or have questions? Go to

stratifiedauto.com

#stratifiedtuned #stratifiedauto #sparkplugs #misfires #techtips #focusrs