I'm not saying that it is impossible that the pulley had something to with my problems, but:
I installed the pulley at about 2000 miles (car has 56,000 now), and now all the sudden when I add the AP to the mix, I have a problem. Also, I had this exact same pulley on my 2002 WRX for about 40,000 miles with no problems. I just don't get it.
The Pulley and the intercooler hoses are the only mods that I did to my car before installing the AP. Once I got the AP, I installed all of the exhaust parts and then the AP and flashed to Stg2 93.
The thing that keeps bugging me is that all of my problems occured immediatly after reseting the ECU via battery disconect. This should not have caused any problems, right?