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Re: rough idle
You "could" have a loose CAT, as the engine gets warmer, do you notice if the CAT starts to glow, or get noticably hotter than normal. I have an 00 XJ with 99K+, never had an issue with the CAT. What kind of plugs did you install. If they were a Platnum plug, they should have been pre-gapped. I have the Bosch Platnum plugs in mine never had any problems.
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