 But here's what it is, and maybe you have an idea about what I can do to fix it. I have one. The outside air temperature is 80 degrees and above, and it's a 5.4 engine. Drive it for about a half hour. You know, it gets up to temperature, and you get to a stoplight and stop, and you get this metal vibration noise, and it's like putting a vibrator next to a trash can and hearing the metal rattle. So...