I've had problems recently while driving down the road and the whole ignition system dies. The tach and speedo go to zero, the engine dies and then out of the blue it fires back up again. It doesn't affect any other electrical system because the headlights remain on when this happens. It also seems to happen when driving around 60-70 miles per hour. The problem seems to be getting worse. I've cleaned the contacts on the IC module but haven't replaced it yet. if anyone has other ideas please help. This is on a "80" 280zx.