I can usually tell what a weird sound is, but this particular thing that my car has been doing has completely baffled me. It did this some last winter, and only seems to do it on really cold days. After driving for a while, I will come to a stop and as I slow down, just before I stop, I will suddenly hear a very low pitch moaning sound from the front of the car. I feel a vibration through the whole car, and at idle, the RPM's shoot up to about 2000 and then the car just dies. After that, I can just start the car back up and everything is fine. This is one of the damnedest things I've ever seen a car do. Like I said, it did this a couple times last winter, back before I did my pi swap, and it is doing it again this winter, but nothing really bad ever seemed to come out of it. Anyone ever seen this before?