I rotated them back to where they were, just a tooth back. However, now I'm running into a seemingly misfiring problem afterward. I replaced the timing belt on my 07 Aveo5 LS. I also replaced the water pump, timing belt tensioner, and idler. After putting everything back in, I fired up the engine. The first sound I heard from the timing belt housing was a squeek. This last for about 10 sec. Next thing I notice was that the engine ran fine for 30sec and began to shake intermittenly as if it's misfiring. The engine ran for about 30sec and shut off. I restarted the engine and it ran for 30sec and shut off. I don't know what's going on now. I'm going to reopen the timing belt housing to see what's going on. I'm suspecting that the belt has slipped. Now if the belt had slipped, does it mean that the valves were bent? Also, could you please show me how to retime the engine if the belt had slipped?