When you get a coolant sensor it usually means U are either low on coolant or need to replace all the coolant, seeing the age of the car U probably need clean coolant.
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the black smoke indicates running very rich. you need to have it hooked up to a scan tool to see the readings that the computer is seeing to help find the possible problem. it could be a MAF sensor, coolant temp sensor, high fuel pressure, dirty or malfunctioning injectors, even a bad PCM(computer). so you don`t waste money and throw any more money at this go to a shop that can handle the diagnoses.
First Check All Air hoses. Make sure no vacuum leak are present.
make sure your ignition coil are good. This will make engine idle roughly. For the rpm to high or to low maybe your air idler is no good. If you're car turn off it might be overheated. Check coolant level. Make your not mixing water with oil. Check the oil dipstick to verify. If like a milky color then it's mixing water with oil. This will car to stall and run roughly
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