I was driving home on the highway this morning *3am* and i noticed that the heat needle was OFF the gauge. Past hot. As i coasted down a hill i threw it in neutral, and it idled for about ten seconds then shut off completely, so i pulled over and tried starting it. It was hard to start, and when it did start it idled really rough and blew out a shitload of black smoke for about ten to fifteen seconds, then the idle went back to normal and i put it in drive and drove off. (before i restarted it i checked the water reservoir and it was full.) when i slowed i noticed a tapping sound from under the bonnet and it didnt seem to have the normal power that it usually had. I had checked the oil that morning, and it was just under the full line, and there was coolant in the radiator and reservoir. The car is a 94 VR Series 2 executive, has anyone got any ideas on what the hell is going on?