Mystery Plugs

Apr 13, 2021
16
1
13
USA
Hey everyone, I got an 89 last year and have been finding random open plugs that I was hoping yall could help me identify what they're for. The first one is this rigged piece that is located near the battery.

Thanks for the help
 

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Here are 2 more. First one is passenger side. Second is a junction for the vacuum lines and I noticed 2 were open with no lines.
 

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