I was checking on my car and had it idling in the garage. For some reason I decided to remove the oil cap. I noticed there was a lot of air coming out of the valve cover. I did a compression test and have 180 psi +/- 2 psi on all 4 cylinders. Is this a problem? If it is what might be the culprit? Thank you in advance

 

positive crank case pressure?

http://en.wikipedia.org/wiki/PCV_valve