I finally got a warm garage to work in, was poking around under the hood, and found something, under the rubber hose between the airbox and the TB. This particular item had what appeared to be vacuum lines coming from it, and it was mounted via rubber mounts. Anyway, the plug, about 1.25" across, .25 thick, containing four terminals in a row - kinda looks like this from the bottom -> (0000)
This plug was completely detached. I hadn't been recieving any codes prior to finding this, but i plugged it back into the female plug clipped onto the part, and drove it the 25 some miles home without any lights. it seems to idle a bit smoother though...
My first thoughts were that this part was that PMV that willwren had referred to, but I haven't had a chance to test the TC yet, as there'* no bloody snow up here
Any feedback? I didn't have my book or any time to look it up, and couldn't tell off hand what the part actually is. I can take a pic of the device later today, if that will help.