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Here is your 91 V6 vacuum hose diagram. That I know of, that rubber plug that attaches the two hard plastic hoses to the throttle body is no longer available. But there is nothing all that special about it, and you can use standard autoparts store soft rubber vacuum hose* of the right size to replace the hard plastic if it's become brittle & broken.
* The kind that you can purchase by the foot, when I did mine I bought a few feet of each size and stll had some left over when I was done.
Here is your 91 V6 vacuum hose diagram. That I know of, that rubber plug that attaches the two hard plastic hoses to the throttle body is no longer available. But there is nothing all that special about it, and you can use standard autoparts store soft rubber vacuum hose* of the right size to replace the hard plastic if it's become brittle & broken.
* The kind that you can purchase by the foot, when I did mine I bought a few feet of each size and stll had some left over when I was done.
Second this. No idea what the part that goes into the plenum is called. I broke one too many 40 year old brittle lines and just bought a few feet of Dorman replacement emissions line.
While that is indeed vacuum plumbing, I'm not 100% sure it goes to the rubber block on the throttle body, it looks more like it could be a piece of plumbing from the cruise control and HVAC system.
Does your cruise control work, and does your heat/ AC work properly (and not blow only from the defrost)? If yes then it likely doesn't belong to the cruise / HVAC, and might be for the fuel pressure regulator and air management valve as shown in the diagram.
Whats this harness goes to? I believe it goes to the air management valve that the vacuum hose from the above pic might go to. Is there a black plastic air valve mounted near the top of your air pump?
Please realize that the only V6 I've ever seen was a 2.8 1989 version, I've never seen under the hood of a 3.1 and I do know that there are differences (electric VS vacuum controlled EGR, for example). This is why I'm not willing to state "this is absolutely this" or "that is absolutely that". For another example the 1989 2.8 was factory built without an air pump, yet another difference between the two.
