4.4i high idle after TB gasket replacement

[ChevDog1]

Last week, I finally got around to replacing the leaking TB gasket on my 4.4. This has cured the stumble at very cold starts (freezing and below), but seems to have created a new problem. I drove the car around all day yesterday doing xmas shopping with my wife, and it now idles a bit high when it's warmed up. I'm guessing that I must have created a small vacuum leak somewhere when I was replacing the gasket. Any ideas on where/what to look for? I did find a bad vacuum hose (the 1/8" one at the intake elbow), which I replaced while I was in there.

The car used to run perfectly when warm, and had a bad stumble/misfire/SES light if you let it sit outside overnight in freezing temps. Now the cold starts are cured, but it has a high idle when warm. My best guess is that the new TB gasket cure the cold start issue, but I created another leak in the process which is causing the high idle when warm.