weird hard to explain noise

[John Lenin]

Could be loose airbox too ... I have a "rattle" type noise coming from under hood on the driver's side ... does not sound metallic and occurs with car at high idle (i.e. cold start-up), or when stopped with trans in "D" & holding car with brakes ... popped the hood and grabbed the airbox with both hands and the rattle went away ... just have to figure out how to tighten 'er down!