Thread: 8 rib help! asap please!

No it doesnt feel like its missing. I took the s/c belt off and it runs absolutely perfect. This is what really puzzles me. I even put the 6 rib belt on it and it still does it so i know its not the belt thats hitting. I was leaning towards one of the 8 rib idler pulleys. i wouldnt think the crank pulley would be messed up?