It started about two weeks ago. When I leave off throttle I get a noticeable rattle that seems to be coming from forward of center in the motor. No noise on acceleration or cruising. It's more pronounced in lower gears. The motor is running good with no loss of power. No backfiring. Just this God awful rattle. Timing belts were changed two years ago. I considered the water pump but wouldn't it rattle constant if it was dying? Got me scratching my head trying to figure out this noise.