Ok so I shimmed the valves today on my 02 426. It was running perfectly fine before hand with just a little valve noise. Everything went fine...or so I thought. Put it all back together and it took about 20 kicks to get her to fire up. She wouldn't idle to save my life even once it was warmed up. It was doing none of this before the shim job. Maybe I am off by a tooth? I'm not sure...any ideas?