You can try cleaning the MAF. It might do the trick. At least this procedure is cheap.
If a clean MAF doesn't get it, you will have to check for a vacuum leak in the intake tract.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
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