i have had a problem with oil in my intake manifold recently and i dont know where its comming from.....um i tried to clean the intake valve under some elses suggestion after my car was idling funny.... but there was oil b4 that im worried this might be a serious problem let me know...its a '92lx maybe its just age??

 

it's from the pcv valve ( off the valve cover) and the breather tube that goes from the valve cover to the intake. Most people get a breather filter and you can also get an oil catch can ( or a universal fuel filter ) to connect to the pcv.