Spark plug help needed
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Joined: Jun 2010
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From: southern, ca
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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MC36
US Lower Atlantic
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Sep 1, 2015 07:34 PM
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