high idle % - few processes - 3.0+ load???

I have a load of 3.0+, less than 90 processes, and 90%+ idle. Nothing like a runaway cgi processes or a stuck VIM happening. In fact, Top says Top is using the most resources at the moment. Any ideas why the high load but what appears to be little system usage? This happens occasionally but always settles down after a while. I'm just curious as to what would be causing this. On a daily basis my system load averages around .15. Thank you.

 

 

 

 

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