The MIL eliminators have nothing to do with A/F ratios.
Before assuming that there is an A/F ratio problem, perform diagnostics with an A/F meter to verify and quantify any problem which may (or may not) exist.
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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