hahacker, I am having a similar problem with my teg. After the car has fully warmed up, the idle likes to dip like yours and will almost bounce off the bottom end of the revs. (100-200 rpm). I usually have to hold the gas to keep the idle up at that point. Lately I have been turning on my radiator fan and this has brought the idle up a bit. I have noticed that one of my injectors is not firing properly so maybe you have a related issue? Just a thought. Good luck with everything and let us know what you find out.