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I've seen other with this issue. Didn't see anyone resolve the issue. Not sure which cylinder is 6. Any help would help... before I dish out $$$.
 

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it is in the front by the radiator closest to the transmission and I have been chasing it for 2 months and I have not found it yet tried 3 sets of plugs and msd coils and 10 plus tune revisions also drilled the intercooler weep hole and still have the same problem when I get over 17psi boost
 

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I did car runs great on stock tune only 14 psi boost was told that they could not find any issues and the code p0306 did not return while at ford , also did a compression test and it turned out good 150psi
 

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My car is still under the 3/36 warranty so I did not want to take into ford tuned
 

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ford will know it is tuned because most tuners lock the pcm when you install the custom tune file
 
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