IAC, youre talking Chevy talk there, boy!!!!!! Actually, I'm not sure what we have that acts like an IAC. And I have no idea how it's interfaced with the ECU as pertains to the VSS (vehicle speed sensor)
On my chevys, if the IAC is acting up, it usually is indicated by the engine more slowly responding to idle commands, like keeping a high idle after warmup or not keeping a high idle during warmup. But for it to act like this, through all these conditions (outside air temps from 0-100, engine temps from cold to normal) it would seem to be possessd.
If it only didn't just return to normal ops in a short while, I could have it figured out. But the second that speedo drops to zero, it behaves normally until you get the speedo above 3-5 mph. I have tried like a hundred times to stop, get out and look under the hood, but it drops that quick.
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I used to own one of the first SRT-4s sold, bought it new in Feb 2003, sold it Nov 2006 with 75K and Stage 3. Now I drive a 2006 SRT-8 Charger.
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