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Mystery Plug...?

   
Old Feb 20, 2025 | 1:11 PM
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Jakester455
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Default Mystery Plug...?
Does anyone happen to know what this is? This is on a '98 Silverado 5.7. I've had the truck five years, never noticed this. Hopefully it's just a diagnostic plug. Thanks. - Jake

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Old Feb 20, 2025 | 1:35 PM
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Rednucleus
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Looks "oldie-moldy" never in use before - but I don't know what it would go to
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