Quick question.. I've noticed when the a/c is running. my car seems to run a little rougher than normal. w/o the a/c running, everything is smooth. No idle change though but i can feel it though. could this be a sign of a bad PVC valve?

Thanks in advance for any help

 

found the problem.... well make a long story short.. i accidently broke a piece on my fan blade... i believe that the vibration i'm feeling is the fact that my fan is off balance now b/c of that..... i notice it only on high fan speed but once it dials down, the vibration goes away

 

Good to read you found the smoking gun , it is not a big deal then