Computer Slow (Unusable) When Charger Plugged In

Hi, For a few months I've been having issue with a periodically slow computer.As it says it the title of this post, I noticed that when my computer is plugged in, it runs so slow that it is unsable. I have all my drivers up to date, I have checked that my power options are set to maximum when on charger, etc.
If I remove the battery and plug the computer : same problem.If I use my HP docking station (power cord in the docking station instead of the computer directly) : same problem.I cleaned my Event Logs (after backing them up): same problem.I checked for unwanted processes when charger is plugged : nothing significant.The computer is not heating when plugged in, fan is running fine, I have the active cooling setting enabled, and no temperature alerts. I've read on some shaddy forums that the problem could just be my power cord being defective. It that possible?Is there a way to verify this assumption before buying a new power cord? Could it be the plug FROM the computer that is defective or since the problem also happened when docked is it unlikely? Thank you in advance for any answer/input/information. MCC 

Try resetting the SMC first http://docs.info.apple.com/article.html?artnum=303319
Then check your battery version System/library/systemconfiguration and check is 1.2 if it is 1.3 drag it to trash and reboot then run software update to install 1.2
Check firmware update in applications/utilities
Finally calibrate the battery http://docs.info.apple.com/article.html?path=Mac/10.5/en/9036.html
If none of those help welcome to the club of the sudden shutdown...

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