What is causing my server load to spike?

I'm a novice, so please be patient with me What is causing my server load to spike?

I have a dual xeon dedicated server with Redhat Enterprise 3, CPanel, and WHM running some vbulletin forums.

98% of the time it runs great with a server load of around .30-.50. However, every now and then it spikes to 2.00 - 4.00. There isn't a substantial change in users on the forums or anything, just a spike out of nowhere.

What is the best way for me to find exactly what is using all of the CPU power?

Thank you kindly for any help.

 

 

 

 

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