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This topic is covered several places on the board. The most comprehensive spot is in the FAQ at the top of the page. The MAF info from that FAQ is copied below.
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Q: How do I clean my MAF (Mass Air Flow) sensor?
A: Thanks to Rockledge in the 3.0L forum here are some instructions for cleaning MAFs. The ones in the 97 and up trucks are accessed a bit differently...you remove the air cleaner housing as if you were replacing the filter and then you can see the MAF inside the big hose that goes to the Throttle Body. https://www.ford-trucks.com/forums/s...threadid=126093