This thermal problem have a variety of causes. It is most likely the thermal sensor that adjusts the fuel to the engine is malfunctioning and the engine is operating under a rich condition. You don't give specific info on what "runs terrible" actually means. Black smoke from the exhaust when the engine is warm and under acceleration indicates a rich fuel mixture. More specific info would help in narrowing your problem down. Is the Check Engine light on?
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Saturday, March 26th, 2011 AT 3:03 AM