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.

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2001 E53 X5 4.4i Sport
Titanium Silver / Black
141k miles, and broken down more than it runs...

2002 E46M3 Convertible with 28k miles - DD