Toyota Repair: 2004 Sienna Timing Belt, crank pulley, cam gear

Question
I am changing the timing belt on my 2004 toyota sienna and I think one of the cams is misaligned.  I used a impact wrench to take the cam gear off, but it turned.  I'm not sure how much it turned, but now it will either line to the right or left of the alignment mark.  It will not stay in the center.  How do I fix this?

Answer
Start over by removing the upper part of the belt from the cam gears, set the crank pulley at the zero mark and then line up the cam gear starting with the left side of the engine(near the radiator) first then the other cam, you may have to rotate the engine a couple of times.