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Posted on Jul 03, 2011
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2006 GMC Sierra Flex Fuel 5.3 What Kind of spark plugs do I need?

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  • Posted on Jul 03, 2011
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There should be an emissions decal under the hood that has the spark plug type info that was installed at the factory.

Randy Ohler

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  • Posted on Jul 03, 2011
Randy Ohler
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I don't know the plug numbers, But I highly recommend you go with Original Equipment. There should be an engine sticker under the hood that gives you the info that your looking for. Also the parts store will give you OE if you ask for it. If it doesn't recommend platinum don't get it.

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  • Contributor 6 Answers
  • Posted on Jul 03, 2011
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