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According to the 1999 Ford F-150 owners manual :

For all the engine sizes ( 4.2 liter V6 , 4.6 liter and 5.4 liter V8 engines )

( .052 to .056 inch spark plug gap )

** confirm with what is on the VECI ( Vehicle Emissions Control Information ) sticker in the engine compartment **

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11y ago
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Q: What is the spark plug gap on 1999 f150?
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