There can be things other than the IAC that cause the fast-slow-fast-slow idle. I put a new IAC on my zetec, and it still searches up and down for the idle, so there are apparently other contributing factors. I just haven't found them yet. I bought a TPS a couple of days ago, but haven't gotten it installed yet. Maybe, just maybe..........
95 Contour Zetec, ATX (wrecked, sitting in the barn)
95 Mystique Zetec, MTX
2000 Taurus SEL 3.0L Duratec
1994 Crown Victoria LX 4.6 V8
1993 Chevy Silverado 4.3 V6
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