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Balto gives good advice on the plugs. Something else you may not know: The Insight needs spark plugs that are specific to Insights; and they're indexed to each cylinder. This helps it reach AFRs as lean as 25:1. You need to make sure that you look at the stamp on the cylinder head next to each plug and the correctly indexed plug, or it won't run well, especially in lean burn. The plugs can be A, B, C or D, and must be torqued exactly to spec.
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