Question about 2002 Chevrolet Silverado 2500HD

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Changed spark plugs with double platnum autolite factory gaped at .040 and the ones I took out were .065 with no missfire also changed wires and now have a random missfire the origanals had 125,000 miles on them .By touching each exhaust port it appears they all are fireing?Im thinking I have a bad plug or a coil going bad? Email address is c_faga@msn.com Thank you

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Try new plug wires - I suspect them because by putting new plugs in, you amplified an existing problem with plug wires.

Posted on Mar 23, 2011

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On worn out or low compression cyclinder,you should add a Spark Plug Non Fouler shield to protect the plug.
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