I wanted to clean the inlet manifold, when I disassembled the manifold, I saw the EGR inlet plate was not in place, And my inlet manifold was completely choked. Also 4. cylinder inlet pipe has a ball like muddy-oily thing that works like check-valve and blocks the air for 4. cylinder under pressure. Found that Oil Separator outlet pipe connection was broken.Now all of them is clean, and I blocked the EGR both in&out. I made plates by myself. I drilled 3 mm diameter, 2 holes on it. now car uses almost 1lt/100km less than before. Goes better with lower rpms, Smoke decreased %70. And I feel that engine sound & vibration became powerful. I can feel engine grunt .