I have been reading some off the post about headgaskets going on these cars.Some off the signs are blow by,running etc. Well today i took my gn for a ride and a soon as i get into boost it has a weird miss almost like its hitting a rev limiter sound.One time going to accel on to highway it popped threw the intake ,and I was just easing into it.Temp gauge is showing 180 all the time with electric fan on high. Also i did notice when looking under hood I have oil coming out both breathers in valve covers.I have not pulled plugs or pressure checked cylinders.Maybe it is something as simple as a bad plug but I doubt it with my luck...What do you guys think...