Ok, when I start my car up, it's fine. Idles nice, and it runs like a dream for something with so many miles (going on 275k)....after driving for say, 45 minutes or so, it starts to lag, and eventually starts missing out and dies when I hit the brakes. At this point, it has to sit for about 20 minutes until it will run again, but when it does, it's fine. I've been told the coil pack's getting too hot, and I've also been told it might be the crank sensor. Does anyone have any ideas?