Won't Start...
 

My 2012 Infiniti g37 makes a firing sound but not starting. Been in the Infiniti shop in my town couldn't find anything wrong drove it for several days ol now won't start again. I've replaced the battery so I'm thinking it's the starter.

what in the world is "firing sound"? are you saying its cranking but does not run? if the vehicle is cranking it is not the starter.