Pretty sure I got some fake Denso's on eBay. I installed these eBay Denso Iridum plugs about 65k ago. I recently started experiencing an occasional stumbling under light engine load/acceleration. I figured it was time to replace the valve cover gasket anyway so it was a good time to check the plugs also. Pretty sure I found my problem. The range on the gas was .080-085 on the 4 plugs. OEM gap is .044
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