You can try cleaning the IAC, but be prepared to replace it if cleaning does not fix the lack of idle control.
The P1131 is not related to this symptom.
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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