what is a good spark plug for 4.0
05-12-2010, 07:56 PM
#12
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Join Date: Dec 2008
Location: Calgary
Posts: 215
Re: what is a good spark plug for 4.0
Im running AC Delco plugs (not Platinum), I found the NGK and Champion platinum and non platinum plugs made the jeep run like crap, she seems to like the AC's a whole lot better.
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