I did too, and one of my replacement plugs had a faulty post.
then the one I got to replace that one was cracked as well...
3rd times the charm as they say
I would double check just to make absolutely sure.
also, take a look and see if there is spark from the wire onto the exhaust manifold, even after doing the changing of these things on my truck (new plugs/wires) I can still see some spark occasionally between the plug cap and manifold.