Timing.

#1
How hard is it to set the timing on a 07 gt 4.6 3v? I recently changed the cams to ford racing hot rod cams and now car is throwing the cam sensor codes and I just want to make sure that the chain didn't jump a tooth on the lower fears. When I did the cam swap I used the cam chain wedge tool. I'm just nervous about it now and just want to be sure. If it is off the marks I how hard is it to get them back to the right spot?