Weird Vacuum Leak

[Fifty150hs]

I've been chasing a code that pops up. I get a cel and the code is for trim too rich bank 2. I can reset it it and it goes for a while and then comes back. Thanks to someone on here mentioning that over rich can be caused by a vacuum leak (counter-intuitive - would expect lean codes), I did a smoke test. Sure as s**t, smoke started pouring out of a crack in the portion of the intake elbow that goes to the idle control valve. And I mean pouring. Wrapped it with rescue tape and retested. I still got a few wisps of smoke, nothing like before. Ordered new part and will change this weekend. In the mean time, fuel mileage is better, long term fuel trims are better and no code. We'll see if everything holds after I put in the new part.