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you could try AEM's sensor test to see if the sensor is still good. Basically you just have the sensor out of the exhaust but hooked up then turn the key to the on position, but DONT start the car! Afs should read super lean, be careful too bc the sensor gets hot. Then dampen a paper towel with brake cleaner and put it around the sensor- the Afs should go towards the max rich. If they fluctuate the sensor is most likely the problem.
Could look up the vid on youtube too, its by AEM and steph demonstrates it
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