WUR Vacuum Connection

I have been trying to research this, but it's not clear. I have an Australian delivered '85 QV which has a problem maintaining idle when warm. The usual scenario is a longish drive on a highway, then down the off ramp to a red light and it dies. Can be maintained with throttle, and easily restarted.
I was thinking air leak, which sealed when hot, leaving it too rich. It also has the typical hard to hot start after a few minutes, and I have replaced the accumulator already. I removed the throttle body to get at the injectors (will be replacing them), when I noticed that the vacuum line to the WUR was before the butterfly, not after it. Shouldn't it be after (downstream of) the butterfly? There is a blanked off port there, which may have been for (long gone) pollution system (no cats, but I think they had EGR).
Any thoughts?
The WUR has only one vacuum connection. I've seen diagrams in my research showing two for some markets.

 

Thanks Andy
The WUR has been rebuilt, so hopefully working

Thanks Steve, that makes sense. K-Jet without lambda on the QV

Thanks Karl, should have the injectors in soon - very busy at work this time of year!

 

Thanks Karl. I've bought a few bits from the US, but the shipping is outrageous! The yanks really are getting screwed on this. If ever you move home, I'll get an order together to stuff into your container! Watch out for those icy roads.

 

Having looked at lots of pics of the 1,000+ variations in design of the WUR, and studied their working principle, I went back to a basic medical adage: "most mistakes are from not looking, rather than not knowing", so I had another look and realised that my model doesn't have the load compensating vacuum connection - the hose is merely a vent to atmosphere, and so plugs into the intake before the butterfly (presumably to keep crap out of the WUR).

I did get the injectors in, though, and have noticed an improvement in mid-range torque (using the arse-o-meter), but still having idle problems, so it's time for an expert with a gas analyser to set the mixture properly and go from there.

In the midst of all this, the starter motor has packed it in. Don't you love these cars?

 

Yes, quite. I'll get the control pressures done when the mixture is set up - WUR was meant to be done by a reputable firm, but always worth getting some measurements. I'll also check the connectors.

 

I just put a gear reduction starter in. Bugger me, does it make a difference! Part of the hard to start issue may have been the old starter (a 328 one, as it turns out). No access to a gas analyser, so I'm going to cautiously lean it out a bit, measuring the mixture with Special Tool No. 1 (my nose), and then dyno it with Special Tool No. 2 (my arse).