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While you're at it.... check the resistance on your coolant temp sensor. I was doing a recording on datascan last night, and my CTS was read 202 degrees! I freaked out, even though the gauge showed normal, but calmed down quickly, and changed the sensor, and it dropped from 202 at idle to 178.7 If the sensor is reading that the car is really hot, the ECU is going to reduce the timing, and richen up the mixture in an effort to try to cool the motor down.
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