Like the others have been saying you need to clean the hot wire inside your MAF meter. It sort of looks like a light bulb filament. There are two in my zetec MAF.
I used electronic contact cleaner to clean the "filament" , the contact cleaner leaves no residue. I did not clean the contact on the wire connection or harness.
You might spray the "filament" with a stronger cleaner like electric motor cleaner or brake cleaner before rinsing it with the electronic contact cleaner.
