I've got a 88 Jetta that dies on me every time the car reaches normal operating temperature. I'll be driving down the highway at 55mph, and the tach drops to zero. No bucking or coughing like the fuel pump is cutting out. I still have power to the rest of the car (radio, lights, etc.). If the car doesn't kick back in, I have to pull off the road and try to restart it, but it's very hard to start. I have to try repeatedly for a couple of minutes. It eventually fires back up and runs fine for the rest of the commute. Today, I went out to my car about a hour before I left work and started it up and drove it around the parking lot. I parked it, but let it idle for a few minutes. Once the temp gauge got to normal operating temp, the car shut off. It was hard to start as usual, but ran fine when I started it back up. Very strange. I'm going to drive my truck to work in the meantime so I don't run the risk of it deciding not to restart and try to get the car to die in my driveway this weekend to verify that it's a spark issue, but in the meantime does anybody have any leads as to what could be causing this?