Went to autozone to get a replacement plug and an extra just in case. Most of them were cracked too. Had to pull 9 out to find 2 good ones. The manager just gave me 6 of the NGK equivalent and said he was going to pull all of the plugs that came in that shipment off the shelf.

Replacing all of my plugs i found 3 more cracked. Id say it ran pretty good for having 4 of 6 plugs cracked.

Im a little ashamed i diddnt notice when putting them in. I typically pay attension to details.

Same thing happened to me on my last engine change. I had a P0304 misfire(cyl 4) and it was a cracked plug just like yours.