Hi. I've got a subaru impreza 2004 WRX. On Friday I was driving and realised that it was hesitating at four thousand rpm, drove for a little longer and the engine management light started flashing and the car was juddering going up hill and loosing power, I realised I need to get home ASAP which I did. Even on tick over now the car is shaking and not running right. I know it's a long shot but does anyone know what the cause of this could be