High CPU Usage when charging Macbook Pro 2011 13"

Hey,
Over the last week or so I noticed that when my Macbook Pro (Late 2011 13") was switched on and charging the CPU usage shoots up to ~90% with the fan operating at roughly 6.2k RPM. I have had the laptop a year come the end of the month and mainly use it for word processing, coding and general web browsing.
I updated OS X to 10.8.3 this morning and the problem still exists. If I remove my charger the problem goes away.
I've tried resetting the SMC but I don't know if it worked.
Has anyone else had this issue and been able to rectify it?
There is no Apple store in my home town and I'm praying there is something I can do rather than drive 20 miles or so to the nearest store.
If it is of any benefit, it is the stock build in terms of RAM and HDD (haven't got round to ordering an SSD yet ).
Mountain Lion OS X 10.8.3
Boot ROM Version:          MBP81.0047.B27
SMC Version (system):          1.68f99
Thank you

Hi Fernando,
I came across a Google search result which was from a forum belonging to a folding application I had previously installed, I cannot recall the name of it.
When I checked Activity Monitor application I could see that there was a process belonging to the folding@home application. Even though I had removed the application it still left a file behind which was continually being used (somehow).
Hope this helps. You may not have had this application in particular, but I guess there could be similar behaviours with other applications?
Kind regards
Jamie
Message was edited by: Kurakai87

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