Winds way up with a whine for the immediate 2-3 seconds after a cold start only and settles down as normal. Disturbing new sound and action that just started in the last day or two. 216k on the clock. Have not ran a scan and found nothing in a Google search.

 

If ambient temps have dropped recently when your starting the motor, it's normal.
Cold start strategy is as follows;
When the key goes to run before cranking, the computer looks at the values of the cylinder head temperature sensor (CHT) and the intake air sensor (IAT).
These values determine the ignition timing and amount of extra fuel injected to a cold motor. This is the only way the system has to know it's to be a cold start and set up for it.
The Intake air controller opens and causes idle speed to increase.
There is actually a back ground timer in play at the same time to bring the fast rpm down if it goes on too long after the Ox sensors take over fuel control, normally in about 1 minute.
In very cold temps the high idle could stay up several minutes.
If this kind of strategy were not in play, the motor would stumble on cold drive-away.
If your idle comes down to normal hot idle of about 650 inside of a minute or so there is nothing wrong. It's working as described.
Good luck.

 

No, when I mean cold start I mean non warm engine. Initial startup. I have had the truck for 8 years, this is something new.

 

I just described the cold start sequence. Review it again. See second line 'cold start'.

There may be something else going on such as a faulty or dirty IAC.
Remove it and try cleaning it with spray cleaner being sure the internal pintel is free to move over it's range.
It may be stuck open from the last hot run and closes when the engine heat begins to build after a cold start.
Good luck..

 

Temp is 5 degrees colder today than yesterday. That is/was not the issue. A closer inspection found an air flow sensor(in the bottom of the air pipe going to filter had fallen out and was laying on the serp belt. Not sure if it was bad or not from damage. Took it for a drive and made it a mile down the road and the idler pulley seized. Not my day.