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2008 Ford F250 6.4 power stroke with a s366 and stock fuel it has been tuned but when I first start it up it it hazes blue bad and after it idles for a minute it with throw a cylinder 2 misfire code so I replaced a injector and it still does the same thing. I can’t figure out what is wrong with it. So I’m assuming it’s in the tune. Any advice would be appreciated.