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What is normal MAF reading?

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I have a 2004 Ford Explorer 4L 169k miles. The MAF is reading between 0.73 - 0.75 lb/min range and even fluctuated as low as 0.63. and as high as 0.89 lb/min. Is the range normal, if it’s not, what is the likely reason for it and what is the proper range? Thanks. 

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MAF
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Here's information on MAF sensor testing:

https://www.alldata.com/sites/default/files/file-attachments/maf_sensor_testing_110918.pdf

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