Question about 2002 GMC Envoy
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Posted on Jan 02, 2017
they come pre gapped with collars to prevent the electrodes from getting bent .platinum and iridium plugs will have the surface damaged if you were to adjust them with a feeler gauge,like old plugs had to be gapped. ac or ngk plugs come pre gapped in the box.
Posted on Aug 22, 2009
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