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US Air Force (retired)
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Yes. The electrode is probably pretty short widening the gap. I run NGK plugs but because of my mods I have to run a one step colder plug than stock.
 
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I changed my plugs at 160,000... the spark gap was HUGE! Don't know, how they even fired? I did a complete electrical upgrade.... NGK plugs, demon coil and taylor wires. Car feels much more responsive now. I might do a CAI and give her a tune, but 4.0 just isn't going to produce much increase in HP.
 

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Yes. The electrode is probably pretty short widening the gap. I run NGK plugs but because of my mods I have to run a one step colder plug than stock.
Reminds me to check the spark plugs on the GT closing to 150k miles, need to finish first the installation of the brake kit plus wheels and tires on the current TJ project. The plug looks good the last time we checked like 40k miles ago.
 

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If I got over 150,000 miles on my sparkplugs, I sure as hell would replace them with what I took out :).
 
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