Cold weather driveability issue

[wolds]

Hello all, I have posted this question on the Rennlist site but the issue is not resolved and I thought I'd try here. I have a 1983 911SC ROW which I purchased in August of this year. The engine runs strong and up until the temps in central Ohio have fallen I didn't realize that the enrichment and elevated idle speed systems were not working. The car starts fine, but idle is low and sputters till it gets warmed up (usually within a few minutes). I have ordered a fuel pressure test gauge to access static, cold and operating temperature fuel pressures, but I thought I would post what I know so far and get your advise on how to proceed. First, I have confirmed that I have 12VDC at the WUR and at the AAR. I have also measured the resistance at both components. The WUR is 27ohms and the AAR is 21ohms. I pulled the AAR and observed that the valve is about 50% open when cold. I connected 12VDC to it an observed that it would fully close in approximately 2 minutes. I then put it in the freezer for 20 minutes to reset it back to its initial state. I have attached a picture of the WUR which I have a few questions about. First, I see a yellow electrical connector on the one fuel (return line?) coming off the WUR. Any idea what this is for and why it isn't connected to anything? Second, I ran accross a post from 05.15.2012 on this site from Vereeken in Belgium with a hand drawn picture of his enrichment circuit and see that there is a thermo valve in series from the WUR to the Decel valve. I don't have a thermo valve on my car, but I do have a tee coming off the decel valve with a 2nd piece of vacuum hose coming off it that is plugged at its end. If I had to take a guess I'm thinking that somewhere in the past the valve had been removed and the line plugged. Does this seem like a reasonable assumption? If so, do I need the valve and where does it mount? I'll have the fuel tester next Monday so I can speak about fuel pressures then. Any advise would be appreciated. Thanks, Warren

[Ronnie's.930]

Do you realize you posted this in the Engine Rebuilding forum (as opposed to the 911 forum)?

[pete3799]

Any chance you could post the part number on that WUR?

[wolds]

Sorry about that. I moved this post to the correct forum.