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Old 10-01-2008, 01:08 AM   #6 (permalink)
Unforgiven
EcoModding Apprentice
 
Join Date: Sep 2008
Location: Indiana
Posts: 131

Impala - '04 Chevrolet Impala base
90 day: 32.84 mpg (US)
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You will be best served in simply getting a single pole platinum or iridium plug and making sure the gap is set correctly. Dont forget to inspect the plug wires to make sure no grounding out has happened and no cracks in the insulation.
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