I bought an o ring to fit over the PCV valve, put it back into the engine, started it, pulled the oil fill cap off and......... no more suction from the valve cover, and the engine still ran smooth. Great find guys, I appreciate all the help!!
I don't remember why I even pulled the oil cap off originally when the engine was running, just screwing around I guess.
Maybe it'* a good thing I did, otherwise I never would have known about that missing o ring.
I'll have to keep an eye on my oil consumption now. The car is burning oil, and every now and then when I start the car there'* a big cloud of smoke behind the car. Maybe now it won't do that and burn so much oil. Thanks again!