'94 TBird LX V8, 66k nursed (mostly city) mi. Only parts that
are not original are plugs, wires, air filter, battery, and MLPS.
The idle is lately doing unexpected things every once-in-a-while.
For instance, today I started it cold, waited 'till the idle came
down from 1100 to about 850 rpm, put it in N and coasted down
my hill. Bottom of the hill, I shifted into D and it revved up.
I shifted back into N: it got up to 1500 rpm (gas petal was
never depressed). It calmed down and ran normally thereafter
for about 16 mi. It was about 50 F outside today.
Does this sound like the IAC? If so, should it be cleaned? Replaced?
Anybody know of a picture or diagram of precisely this 4.6 with
pointers to the common replaceables (EGR, IAC, etc) on the net?
"Well, there's two trains runnin'.
Ain't neither one goin' my way.
One run at midnight,
the other run just before day."
- from "Still A Fool", Muddy Waters, maybe 1949