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So I've had my e30 for almost a year now, It's finally time I try to address the high idle (1000-1200rpm, when warm in neutral). I have replaced the obvious stuff (Intake boot and a visibly cracked hose). But I noticed when doing my timing belt and water pump that on the distributor there was a vacuum port with no line connected to it. I'm guessing to advance the distributor timing. Idk what took me so long, but I'm finally going to plumb that back up, I looked on realOEM and found the section I'm looking at but cannot figure out what the vacuum line goes to. I haven't taken the cold side off to have a proper look but it's not immediately obvious. Here's the diagram. If you look at where #15 connects to the distributor, I believe that's what is in my picture. It goes to #12 but #12 isn't listed on realOEM, so I have no idea what it is. So, What is #12 and where in the engine bay would I find it? Here's my image: My vacuum lines aren't quite routed the same, and it doesn't appear that I have the second vacuum port on the distrubutor (shown in the realOEM diagram), but I haven't looked closely either. Also, for the jetronic experts out there. Is it likely that this leak could cause this big of a jump in idle revs? I could always just bite the bullet and pay for it to be smoke tested. As always, thanks for the help! You guys have saved my ass once before.