Explorer is burning oil and anti-freeze but its not the head gasket

[Motsiball]

I could use some input on what you all think the problem is. My 2003 4.6L Eddie Bauer 4x4 Explorer is burning 2 quarts of anti-freeze and 1 quart of oil every week. Its not over heating. It runs fine. There is no oil or anti-freeze leaking out onto my garage floor. The immediate thought was head gasket but we used Napa "block tester" coolant leak test and it showed that the head gasket was fine. We had someone tell me that he had heard of the water pump valves going bad which caused this and someone else told me that he had heard of the intake manifold or gaskets going bad which would cause this. Its been doing this for a while so now its throwing a catalytic converter code so I assume its filling it with a bunch of crap since its burning all that oil and anti-freeze. Any ideas on the problem is appreciated.