Problems with the MAF can give a fast, smooth idle. Mine became disconnected one time, and I was idling at 2K, with the rpms occasionally climbing to 3K. Re-connected the MAF, and the rpms dropped to 800.
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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