It started two days ago, the car is a 99 SVT contour, it only has 46K on it. First i thought my exaust rattled a heatshield loose, but last night i noticed it getting louder, so i popped the hood, and it almost sounds like a lifter knock. How do i go about geeting this problem resolved. I dont want to drive it until i figure whats wrong. Any help is greatly apprciated...