Quote:
Originally Posted by CounterSpace Garage
When you changed out the MAF sensor from the other Scion, it may have not seated correctly. The MAP sensor is located on the last intake runner on the driver side (closer to the firewall side). Make sure the MAF sensor sits flush with the intake block. 
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I have not touched the bosch sensor that came from edelbrock, only the sensor in the intake. I will check it.