For the past couple of weeks my turbo wagon has had a rough idle with black smoke coming out of the exhaust, I also see the smoke when i punch it at higher rpms. does anyone know what could be causing this? Also today i pulled the codes and got 3 differant ones. They are p0172, p0133, and p0440. I know the car needs the pcv system replaced and a tune up. I have the parts to do them i just havent had the time to swap everything.