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Vs commodore, rough idle then cuts out.

Brbl

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Been trouble shooting my vs, idles extremely rough then cuts out, also makes a hissing noise when started. Did a visual inspection and seems to be missing an air hose on the side of the engine manifold near the carburettor. Does any one know exactly what’s supposed to connect here and how it works?
89104404-6C99-4716-911F-4149190B87C6.jpeg
 

ephect

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If what I'm seeing is correct, that manifold is off a VT, and that hole should house the erg pipe. It's not setup or used in the VS and can be blocked off.

If you pop the 6 hex bolts on the plenum, is that hole blocked or open?

If open that's your main issue to fix first. if not try to pinpoint the hissing location
 

Brbl

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Okay cheers mate, yeah that hole is open.
 
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