Contour Enthusiasts Group Archives Forums General Troubleshooting rattling from belt side of engine

I still need a little help. The sound is there, whether the belt is on or off. Doesn't seem as bad as when the belt is on, but it's still there. The sound is also there whether the engine is on or off, but only there when the car is rolling. The car needs to be shaken lightly over ripples on the asphalt to produce the noise. I've removed the swaybar link, upper stress bar, but the noise persists. My gut instinct still tells me it's a pulley, but I still haven't been able to confirm this. Is it possible that it's the header coming loose? It's driving me crazy, as the car's driveability hasn't changed.

On a side note, the idler pulley rolls freely, but seems to be rough when spinning.