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I'll throw out something...Bad Gas.

Before you waste too much more time, I'd throw a bottle or two of drygas in the tank and see what happens. Especially if you had the tank low and it gets cold where you're at.

Worth a shot - especially if everything is checking out and the ECU is happy.
 

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That says alot actually, the coolant temp sensor is probably bad.

I was thinking the IAC as well, but if its warm and the probelm goes away at idle, then its not the IAC, it's the coolant temp sensor. Usually there are two, one for the gauge and one for the ECU. If the ECU thinks the engine is cold, it will dump extra fuel to compensate. You're probably running way too rich until it warms up and the sensor registers enough heat that it adjusts the fuel mixture (Probably still rich).

Might be worth the cost of the sensor, I think they are pretty cheap. Of course if my point is valid, then you should be able to pull a plug or two when the engine is cold and running rough, and you might see the extra gas on the plug.
 
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