High CPU Idle level

[n3mo]

Hi folks,
I run Ubuntu with Fvwm and without Desktop Manager. At the fresh start my
top looks like this :

Cpu(s): 4.8%us,  8.3%sy,  0.0%ni, 86.9%id,  0.0%wa,  0.0%hi,  0.0%si,
0.0%st

Where this CPU Idle comes from? It's never go away. I mean, when I start
skype, audacious, firefox, etc. CPU usage goes up but the rest % goes to CPU
idle.
Is there way to fix this, before my CPU die.

p.s. Sorry about my bad English.

Best wishes,
Ned
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