2003 VW Golf - engine shuddering, slow acceleration

Hey folks, I've been having this issue for a few days, and your guidance would be greatly appreciated!

My engine started shuddering rather considerably a few days ago, seems to be misfiring. Happens both while idling and accelerating. Thought it could be a bad spark plug, and was prepared to replace them. Which is doable, but not easy, considering they're not very accessible with this particular engine. But when I lifted the plastic cover off the engine to take a look, I noticed this tube (circled in picture) had been worn away considerably in one spot. In fact, it's barely attached.

Now I'm no expert, but I've read that a leaking or disconnected vacuum hose can cause exactly the type of issue I'm experiencing. I'm wondering if the object pictured is in fact a vacuum tube. Might that be the issue? If so, how easy would it be to repair it myself? Thanks!

That line does pull vacuum from the intake manifold. If it is leaking, replace it and see how it runs.

Yes i can see the vacuum tube. Best try is replacing it for a new one...