You did put the MAP sensor back on right?
If you did you may want to inspect the o ring that goes on it.
The pick-up tube does not connect to anything inside the UIM, so you do not need to worry about that, the only issue I had when I did mine was that it was hard to get the new PCV cap on, this was due to that pickup tube being to far up into the new UIM, I tapped it down a little and was able to get the new PCV cap/map sensor on without a struggle.
Just curious, but did you remove the LIM and replace the nylon 6,6, LIM gaskets that are known to fail?
2006 Pontiac Grand Prix GT with SC
1996 Buick Park Ave NA