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Well tonight on the highway I passed someone in 4th at 65ish and let off around 80-85 at 3/4 throttle. When getting of the highway about 1/4 mile later cel came on for cyl#4 missfire, then proceeded to start flashing. I coasted into a parking lot, got a ride home to grab some tools and spark plugs. Put new plug in cyl#4 and swapped ignition coils to see if miss changed/moved. I had noticed an oily/foamy liquid in the intake from the valve cover breather. The miss seemed to have gone away but it still steams/smokes out of the valve cover vent hoses like crazy. The miss did seem to go away after the new plug(wasn't expecting this)
Tomorrow when i can spend more time on this ill post more info.
I BELIEVE ITS THE HEAD GASKET? Ill have to see but I'd imagine if the piston cracked I would see smoke in the exhaust?
The car is a 2014 with an efr6758 @ 350hp
 

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you have a lot of pressure getting into the crankcase. so pressure is leaking from the combustion chamber, down past the piston into crankcase. probably cracked piston/ringland. i would do a compression or leakdown test next.
I 2nd this. Solely out of my own curiosity, who is your tuner?
 

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dang that sucks
 

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did you have a catch can or a breather on the car?
 

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