I have a 1994 Ford Taurus GL. Lately I've been noticing once the car warms up a bit, it starts going wacky. WHen I'm driving Like one minute it'll be at C, next it'll be right in the middle like its supposed to be for like a min or so, then it'll shoot back down near the C, and then its on top of the N(in the word normal) suddenly, then back right in the middle or on the O, whichever you go by, and it'll keep doing this, it doesn't seem like the engine overheats or anything, but it'll do it no matter how long the trip is. So I was wondering what the hell would cause the temp gauge to bounce around so much, and going over bumps don't change it either, it changes when it feels like it. When I'm at idle it does it less, but it still does it. What could cause this?