My Altima, would drive normal for the first mile or two, then it would start slowing down and making a rough noise, and the more I press gas,the more the car makes that rough noise and will not pick up speed, so i pull on the side of the road, shut the car off and then start the car again, and it would start driving normal again, until the next couple miles, the seem thing happens again and i would have to keep shutting off and starting the car again, to reach my destination, can somebody please help me find this problem.