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Message: <blockquote data-quote="Yoyojoejoes" data-source="post: 1045710" data-attributes="member: 75671">Alright I've heard many mixed opinions on this and want to hammer down the best option. Which is truly the best spark plug for this engine? 2007 Ford Explorer Sport Trac 4.0 V6  I just did a replacement of spark plugs With Bosh Double iridium (I know now they are not the greatest for these engines) thinking I wouldn't have to worry about it, but when I installed them I mistakingly broke one of the end of the plugs(Plug 6) leading to misfire and replaced the plug with a Cheap Motorcraft one now it runs fine, but it'll sometimes feel like a slight misfire or something is wrong with the idle and it will happen only on slight occurrences. I'm currently getting a new throttle body (Zabtek)and coil pack (Blue streak) and I've already installed new spark plug wires and cleaned my Current MAF and throttle body and have a KN air filter . I Also have all brand new upper and lower O2 sensors so that can't defiantly be it. the only thing it think it could be is either the 1 Motorcraft spark plug not mixing well with the Bosh or the coil pack(which I'm gonna replace)so either way Im gonna want to get all new spark plugs and can't make a proper decision which spark plugs to get so here are some options I've come up with:I would like to get iridium because I've been told they are the longest reliable spark plug but correct me if that just advertising What I'm looking to get is Mainly gas milage, and of course a little performance in case I have to try and pass someone in my lil V6</blockquote>

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