What is making your 2001 Chevrolet Cavalier to leak around the valve cover gasket?

Possible plugged pcv system causing excessive pressure. It may just be failing gaskets or seals. 95+ cavaliers are infamous for leaking head gaskets. Its a common problem with the original. I had to replace mine with only 18000 miles on my 2001. Take it to the dealer and have it replaced if you have an extended warranty....