Got a van earliest in the spring now that it's gotten cooler it has a rough start hesitation like crazy and puts out a bit of smoke heater doesn't work and I have green liquid coming out of my back passenger side keep adding 50/50 to it. Got o2 sensor reading on computer p0340 p0171 ect ect tries to die on idle I already replaced o2 sensors got an oil change and oil filter light mystical smoke and slight smell coming from the vent with overheating