drag on engine and bearings sound

[surfer63]

Hey guys, I need some of your expert advice. I just bought my 92 LS-L a few weeks ago and seemed to have no problems. For the past week, there has been a strange humming sound coming from the engine bay (kind of like bearings). The engine runs the same except when I give it more gas, the engine seems willing, but it feels like something is holding it back. It seems like one of the accessories is lugging the engine. Does that make any sense? Any ideas?

Thanks in advance,
Matt.