Easy Fix for Rough Idle misfire after Timing Belt Change

[C30quin]

Rough Idle after Timing Belt change and Solution
I just did my timing belt change on a Volvo C30 P1 2.4i exactly following the videos on fcpeuro and mtl carguy.
I got my timing belt perfectly lined up with all timing marks lined up even after 2 sets of turning the crankshaft manually.
I also used the camshaft locking tool which I bought online form IPDUSA.
After everything was done I started the car and it was idling very rough at idle speed. Once the revs went up there was no problem and it went easily to max revs.
From all the online comments and forums I was panicking about what I did wrong and thought it skipped a tooth or 2.
Following my wife’s advice to start with easiest fault finding, the next morning I took off the manifold cover. Then I realized there was a small hose right underneath the manifold cover that I forgot to plug back in when I put back the manifold. It looks like a small breathing hose that plugs just behind the throttle body but directly underneath the manifold, so very easy to miss. Plugged it back in and bolted down the manifold and everything was fixed. Car running normal with idling now perfect. So there was never any timing belt tooth skip as my timing marks still line up.
Fix time 3-4 minutes
Thought it important to post this as no one seems to comment on this.

[funidentity]

I wonder if you recorded the process? If possible please share a video.

[Twarr12000]

Checking the simple things first is a lesson I have to learn continuously. My mind immediately goes to “A cosmic ray probably flipped a bit in non volatile memory in exactly a place where error correction can’t detect it” or something similar.