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Re: missing IAC signal
12+ is always present at the 2 positive wires, one for each direction. The ecm grounds one of the 2 other wires as needed to extend (for less air) or retract (for more air) the IAC valve. In diagnostic mode, the IAC is held fully in one direction (I'm guessing rich) Hence 12V at 2 of the wires. The 3rd wire with 12v is for the other direction, and the 4th wire the ground for that winding. The 800mv at that wire is probably no more then stray voltage picked up by the meter.
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Wanted to buy:
86-88 Fiero GT, 5 speed, fixer-upper. Blown motor, no motor? No problem! Rusty unibodies need not apply.
74-79 Ramcharger or 100, slant or no motor - not interested in v8 - Overdrive 4 is a big plus, NO hopeless rust buckets!!! 
3Rd gen F body floor pans/camaro door skin (L)
 Why is it I see so many "Proud to be an American" bumper stickers on the backs of cars made in Japan or Korea??????
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