Originally posted by LightningLuke:
And would you happen to know what the sensor is on the bottom of the intake tube in-between the MAF and the thrttle body?
Can you get a pic of it?
If the IAC doesn't work check you fuel pressure, the fuel pressure regulator could very well be the problem here. Also how are the plugs and wires doing? Just don't start replaceing parts randomly with out testing first. 
Oh and if you need to move the little plunger in the IAC vavle hook it up to the connector and turn the key to run. Good luck.
1999 Mercury Mystique LS 3L Manual
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