it blew a spark plug out and it won't hold another one in. it's like there are no threads left for it to attach to. it feels like the spark goes all the way to the heads

see first question,and the plug does go in all the way,cause the hole is bigger now.do not start the car.its not like there are no threads,cause there ain't any!!do not start car!!!

See what I mean?

You may be able to fix this yourself with a helicoil kit. Is the hole still round and about the size of the spark plug threaded end? If so get a spark plug hole repair kit and tap in the new threads. Use a shop vac with a small piece of hose attached to suck and dirt or chips out of the hole. Only use it for a short time so you don't overheat your shop vac.