Is there a engine temperature at which the idle will be raised to the 1500 or so that I saw last winter? I start the car now and it goes right to low idle.

Don't hold me to this but it could be the air intake temp during open loop startup. The ATS sensor in the air cleaner box on 2.8's. Not sure at what temp the air has to be for a 1500 rpm idle. During warm weather the startup idle seems normal at 900 rpm.

If I'm wrong about this I'm sure the guru's will be along shortly with the tar & feathers.

Spoon

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"Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne." - Kurt Vonnegut

I'd be curious to know the answer, but my hunch is that it is based on COOLANT temp, not Air temp.
For example, I know for certain my Corvette won't lock up the torque converter until the Transmission fluid temp is about 70 degrees. Air temp doesn't matter on that. But yes I know that is apples and oranges.

I'm pretty sure the high idle is based on coolant temp. Mine will idle up to near 1500 for at least a few minutes anytime the coolant is below about 80F