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  1. OEM Issues
    Hi Everyone. I drive a 2005 TrailBlazer with about 76,000 miles. I want to replace the spark plugs and originally bought NGK Platinums ($3 plugs). However after doing some research (which I should have done prior to buying the plugs :duh:) I realized the ones in the manual are AC Delco double...
    ac delco iridium ngk platinum spark plugs
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