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1999 Chevrolet Astro 4.3L V6, what is engine code W?

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1999 Chevrolet Astro 4.3L V6, what is engine code W?

Vehicle: 1999 Chevrolet Astro 4.3L V6

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A engine code W is ported injector, means each cylinder has a fuel injector other than a Throttle body injector

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