spark plugs
#3
#4
If you have the owner's manuals, look what the factory list. That is your best bet. The ignition system was designed as a complete unit with each part at a certain spec. I had iridium's in my 95 4.0 and received numerous fault codes about misfires on a trip. Hennessy Jag here in Atlanta told me to go back to the much cheaper champion plugs listed in my manual. Mileage improved and misfires went away and yes I used an anti-seizecompound.
Last edited by RonaldP; 03-19-2013 at 12:27 PM.
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