If you aren't 100% sold on the idea, try temporarily plugging it up. Hand cut a small piece of cardboard into the shape of the mounting gasket but don't add the vacuum port hole through the middle of it and test it out. If it solves your running problem you can then choose to either permanently seal it up (epoxy, JB weld etc) and delete the HAC completely, or seal it up and re-mount the HAC solenoid to keep it looking like it's functional.
Hmmm, I've only seen the single vacuum port HAC solenoids. There's a single port between the mounting screws - where do the other 2 connect to? The port I mentioned is the one I'd seal up first but there could easily be a vacuum leak being caused by the other ones and it's affecting internal vacuum metering. If you can post a pic or find a related image it would go a long way to helping you out (you might be either the first or one of very few members that have run into this issue)
Originally Posted by neshyynesh
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