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So I've owned my Z for 2 years this May, and when I first got it I didn't do my own work on it, I thought I'd let a "skilled Nissan certified technician" work on it. However after having some cooling trouble last year, I took a look at my coolant, and found it was black, which seemed weird since my mechanic should have put new coolant in after the TB service. So from there on out I decided I'm the only one who's gonna work on my Z. So I'm looking at all the things that the mechanic did, the latest that I replaced were the spark plugs, which were NGK's....but NGK BKR7EIX not NGK PFR6B-11B, which are .135 shorter then the PFR6B-11B's. I was having trouble with idle issues all last summer, and with these new plugs everything seems back to good. I had to reset the base idle after installing the new plugs, but man does my car feel good now! Just thought I'd share my story. ">La-Z-Link
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