My buddies mustang which is my old mustang is having a problem. so he asked me to find help. I can't figure it out. what is happening is there is a high crank case pressure. now granted he has replaced the pcv valve but still having the same problem. There is oil residue coming out of the k&n air intake. So what I did was take the tube off the driver side valve cover which runs to the air intake had oil in there. and plugged it off the the valve cover side with my finger it built up to much and I had to let go. any Ideas!!