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It's kind of tricky to clear codes.
Basically, you "read" all 3 codes (didn't think it could hold 4), then hold the button down for an obscenely long (8-10 seconds) time. You'll get a solid light. Then hold it down for the same length of time, and the light should go out. Then you should be able to get a 1-1-1 code.
There is no direct monitoring of the vacuum system for problems, so any codes will be thrown because they screw something else up - namely the mixture.
Hesitation and running poorly when in really hot (105F) vs. really cool (60F) temps makes me think the AMM has failed, and your car is running on a sort of limp-home mode, which is rich. Some time, when it's running like garbage, disconnect (do not reconnect with the engine running) the AMM. See if it runs better. If so, the AMM is most likely shot.
Buuut, if the accordion hose is also shot, then it could all be because of that.
The wire is about as thick as the wire of a cheese slicer or a piece of 10-15lb fishing line (about .5-.7mm). It should be visible to the naked eye.
I would do this:
Fix all the vacuum leaks (you can test for them with soapy water or with a flammable fuel source (not brake cleaner!).
Clear the codes
Try disconnecting the AMM.
The reference to the plug on the front crossmember is for something else, not the code reading sockets. I remember the FAQ description being slightly confusing, but not outright wrong.
What do all 4 of those codes mean? We could all go look them up, but it would be better to have them posted.
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