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Hello, my name is***** for the question. When you have high HC's like this it is because you either have Unburnt fuel in the exhaust or the converter is failing. The majority of the time of the car is running fine and not misfiring then you need a new catalytic converter. You can try a temperature test with an infrared thermometer. Let the car warm up and see if it is running at about 350-400 degrees. If it is colder then it is bad. Let me know if you need more help.