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Message: <blockquote data-quote="RAU03MACH" data-source="post: 1581580" data-attributes="member: 23163">Be aware The spark plugs  brand new in a box can also cause misfire Im just giving you a problem in recently  ran into I had done a tune up on my truck 1st round Bought a set of motor craft  from o'riley Second round had to go back in and check every thing thought mabe a coil  3 rd round put the new fox tester on the truck It had a total of 30 misfire  after I changed the plugs 4 th round cleared the codes drove it with fox tester connected   on it and while driving  I could see 4 out of 8 plugs misfire 5 th round bought a new  box of plugs  from fordProblem  fixed Just saying that new plugs  out of a box can be problems to</blockquote>