not sure. i'm not educated enought to think of all the things it could be, or what it definetly would not be, but i wonder if i can do a few different tests to rule stuff out. like i said, i don't know what it could be, but things like compression, fueling, belts/pulleys, bbg, rotors, come to mind. maybe i should bypass bbg and see what happens, replace pulleys and belt, check tension, yadda yadda and start crossing stuff off before i pay for a rebuild. i started that thread a long while back and didn't get many responses other than it might be the rotors.