What is the best air flow reading should be???

Before starting the car the reading from the Air Flow sensor is 1.16v

When I crank the car it jumps to 2.94v

I installed a MAP/MAF enhancer. When I turn the pot a mm it jumps to 4.94v and bout shuts down the engine.

What should the air flow sensor read while idling?

If the Sensor reads 1.16v does the ECM send more gas to the injectors
OR
when it read 4.54v???

Anybody???