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Answered 2007-02-22 14:59:10
OEM, AC/Delco spark plugs. The newest part number AC Delco is an iridium plug and is the perfect plug for the I6 4.2 litre
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Coil pack or spark plug on 2004 Chevy Trailblazer?
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A 2004 Chevrolet Trailblazer that has a 4.2 liter engine will have a spark plug gap of .044 inches. The best spark plugs for this vehicle are iridium spark plugs.
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