Your misfire is far more likely to be ignition related than to be the IAC valve.
Plug wires any time recently?
Inspect your brakes. If you don't feel comfortable doing so yourself, find a different mechanic to do it.
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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