Ok the car hesitates when its trying to start, it is an intermittent problem that only seems to happen after the car is driven for a long period of or if it is driven hard. I thought that it was either fuel or spark related, but I changed the plugs and it still does it. I am going to change the fuel filter and see if that does anything. Has anyone had this problem or heard of this? Also the car has 42,000 miles is there anything else that should of been changed out before that mileage?