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Discussion Starter · #1 · (Edited)

Have a vauxhall carlton diplomat 2.0l with the C20NE engine, there is a vacuum pipe coming off the bottom of the throttle body, I have a really rough idle where the engine revs are hunting up and down, but when i cover this pipe with my finger it idles fine - can anyone tell me where the other end of this pipe plugs onto? (coloured it red so you know which one im referring to)

Much appreciated any answers!
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