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Discussion Starter · #1 ·
My cyl. 1 keeps misfiring on my '98 4.0 XJ. A few months ago I did a tune-up and now I have gone through like 3 spark plugs on that same cyl. I know the wire is fine and I know the plug is gapped right. Should I just keep replacing them as it comes or actually try to figure out why it keeps doing this? Thanks.
 

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how did you check to know that #1 cyl wire is fine?
and what does the plug look like when pulled? soot/oil/gap filled/white?
how many miles on a plug?
 

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Discussion Starter · #3 ·
Went to Autozone. This has happened before a few times so usually when the check engine light comes on, I know. I'll pull the plug and check it, but my old plugs looked good too. I'll test the wire as well later. Shouldn't be but maybe 2000 miles on a plug.
 
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