Originally Posted by A4 2000

I was cruising home on the freeway today and the engine jolted really bad and I lost all throttle response. The EPC light turned on and I pulled over and thought the engine had turned off but the rpm's dropped down to idle speed but the idle was so rough it was shaking the whole car. The weird thing next was that I turned off the ignition and then started the car right up with the engine then running beautifully and the light disappeared. I drove all the way home with no problems. I'd like to understand what the hell happened and if this is likely to happen again.

So EPC stands for electronic power control right? Does this originate from the ecu or is this a sensor related problem? Any help would be greatly appreciated. TIA.