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I took this thing off today, and I'm not sure if it is necessary. By the research I've done, I've found out that it's called a 'main air bleed solenoid'. I have no idea what it does, I just need to know if it's neccasary.
I think that's part of the idle compensation system. It raises the idle when your A/C kicks on. It's the only solenoid you keep from the rat's nest if you still have A/C. If you don't, you can discard it.