My MY01 WRX has had an intermittent misfire from around 500 miles. The car has now down 2500 miles and has been at the local dealer four times to no avail. New spark plugs have been fitted under warranty and this didn't help. The problem doesn't seem to occur at any particular time, fairly random in its nature. Car also seems to be down in power, lacking torque. Will only pull 120mph top speed! Any ideas/ suggestions much appreciated!

Re you sure that it's an intermittant problem, surely it should do loads more than 120!

THE LACK OF TOP SPEED IS THE ONLY THING THATS CONSISTENT,THE HESITATING MISSING AND BASICALLY GOING LIKE A DOG COMES AND GOES TO A VARYING EXTENT.ITS DOING MY BOX IN,SOLD MY GOLF TO SUPPOSEDLY GET A BETTER AND FASTER CAR,NOT WORKING OUT THAT WAY.PLEASE HELP!