Desided to change spark plugs now have surging

I changed to Autolite 25's copper I hear they are an excelent in the foxes. Well I had Bosh platnum 2s in there before. I don't know about 2s but I heard platnum 4s suck. Well anyway I put autolite 25s in and it now runs like crap.

(I just want to know why it runs good with platnum 2s and not autolite 25s which I would thing would be the perfered ones.)

Should I try getting the bugs out or just put platnum 2s in?