Any time your traffic goes up your CPU usage will go up. Based on what you’re saying it could be bot activity. I’m also assuming you’re on a shared host that is overloading the server with 10 billion accounts.
My suggestions include:
- Running a virus scan for WordPress via any number of available plugins
- Minimize the number of plugins you’re running, as they can impact your CPU usage
- Decrease your database size, be sure deleted tables are actually deleted
- Add a cache plugin http://wordpress.org/extend/plugins/wp-super-cache/
- Look for unusual/frequent bot activity and block those suckers
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