you werent measuring it properly.
the Mass air flow sensor puts out a Frequency signal on the signal. it is not a voltage based signal like many foreign cars.
plus without airflow through it you wont find much of a signal....opening the throttle to raise rpm will increase the frequency.
they fracture at the connector to board internally, a gentle (you dont wanna break it if its not broken) flex up and down on the connector should cause it to stumble/glitch if there's a connection problem internally
