Serpentine belt causing rough idle?

Ok so, for a while here my car has been making a rather bothersome squealing noise coming from the serpentine belt in my car(97 civic si) Just over the past week here I finally got fed up with it and gave it a good spray down with WD-40. The noise has died down quite a lot but I've still noticed what feels like an irregular missing all through the vehicle. As in it will miss once, wait a second then do it 3-4 times in a row, wait, then once again, and repeat. So far to try and troubleshoot the problem I've both changed out the spark plugs and ran through a couple different fuel injector cleaners. Both felt as though they were working for a short while before acting up again which could very well be a placebo type effect. I have taken it in a couple times to the shop and had them run a diagnostics on it and it came up with a bunch of fuel related codes but nothing belt related. Could this have to do with the serpentine belt at all and if so what could I do to check it out at home?