Yo, just looking to know what this is, and whether replacing it or not will change anything (it's broken)

The engine idle rpm is oscillating up and down, is a probable cause or no it, and while I'm at it what is the other part seen in the 2nd photo that it leads to, just out of curiosity

I just swapped this 3SGE into the car (ST206) so I'm still working out some small things, but whether it's important or not I'd like to get a replacement

3rd Question, can someone recommend some decent ignition leads, I was going to get the RC-TX117 leads from NGK but I can't find any here in NZ so, if there's any comparable or better leads please lmk, thanks

Thanks in advance:)

submitted by /u/_Cooper_King_
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Source: r/Celica