Spark Plug Advice on 1999 TJ Sahara 4.0 6 cyl - Jeep Wrangler Forum
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Old 05-07-2013, 07:43 PM   #1
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Spark Plug Advice on 1999 TJ Sahara 4.0 6 cyl

I'm getting set to change plugs on my TJ I just bought with only 72,000 miles. I remember reading a thread of folks weighing in on NGK vs. Champion and I remember some thought the NGK made their TJ run better with more power. Mine is running fine on the stock recommended Champions (RC12ECC), but if someone could tell me that the NGK would definitely improve performance and efficiency, then I'll make the change. Thanks.

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