Question about 1990 Mitsubishi Minivan

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1991 Mitsi RVR 4g63 dohc motor- What is the cylinder underneath the master brake cylinder ? there is a cylider ,not the master brake vacum unit ,with a hose going to it and it has a machined hole on the side at bottom ,it ****** air , should it ? Trying to find reason my revs at cold go up and down and wodering if this is part of the problem Cheers. Alex.

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Call a body shop and see where they get it done at, don't go to a dealership it will just cost more. And it's going to be about a grand.

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sent it to a garage to repair, dont know what they did thanks pete

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