Spark plug help needed

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08-05-2010, 11:24 AM

BJdelta

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Spark plug help needed

So I have the 2004 4.2 in my 1998 XJ8 and it's running but a little rough. I'm only using the '04 block and heads. My question is which plugs should I run: '04 NGK IFR5N10 or '98 NGK PFR5G-13E. Thank you.

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