95 3.4 oil leak

I have a 95 grand prix with a major oil leak. I had read on a prior thread that this oil leak is probably from the distributor plug (where the distributor would be on a 3.1). I wanted to know where this is located on the engine and if anyone else has had this problem? I hae already replaced the valve cover gaskets and it is still leaking at leat two quarts between oil changes if not more. I used a dye and the leak seems to be coming from under the plenum somewhere? Thanks for any help in advance
Roger

it is located underneath the right side of the plenum where the air intake is connected, and underneath the exhaust manifold. it is just about right underneath the thermostat housing. little cap and oring