Are you already running the 3.4 pulley? If so I would take that off and put the stock one back on till you can scan to make sure its not knocking.
I think you need to do some research before you go any further with your car. Most cars can not run a 3.4 pulley without some other mods, be it headers, plog, downpipe, race gas and a custom tune, intercooler to name a few.
This thread will give you some better ideas of where to start and where you would want to go. http://www.grandprixforums.net/safel...0-a-67580.html