PCV valve (oil/air separator) location and how to clean

My car is shaking, is eating fuel more and the oil/air separator, which the hose is connecting to the breather box, is "blowing out" air and oil when it should be a vacuum action. My car was frequently stalling at lights. I have watched videos on this issue and spent hours reading forums about it and one Sunfire owner said he detached the hose going into the manifold and his car stopped stalling and the power increased, however, one small problem: the engine now smokes due to oil landing on the hot engine. I have had to add oil to it every few days, but there is no oil on the ground where I park. Another issue is I'm having to add coolant every few weeks. From what I've been learning, I believe I need to "unclog" the oil/air separator, and bought a can of seafoam, which I've already added to the crankcase and gas tank but now want to add directly into the system (in small amounts, very slowly) 6 ounces of the liquid seafoam into the vacuum lines directly. It sounds like my MAP sensor could be bad also, along with my TPS sensor. Any advice, along with pics of which vacuum line I need to use, as well as location of TPS and map sensor would be greatly appreciated, as I cannot find any. Thank you.