On the back of the engine, you'll notice a rubber hose coming out of the drivers side/back of the engine. I'll take pictures tomorrow, but all you have to do is unplug that hose, and clean around that area & poke through any build up. I also wish to let you know that any pressure in the system due to this clogging can be seen in oil pressure creating build up against the dip-stick.

I will post a few pictures tomorrow so you can all see.

HOWEVER
This is really only necessary for those cars before 1996, in 1996 they made the hose larger, and these engines are much less prone to having this build up problem.

Quote from that link.