#2 injector not firing!?!?
 

My car has been running fine forever at 405whp 399wtq outta the blue the #2 injector is not firing and can't figure out why?

How do you know it's not spraying? Try using noid lights to rule out the electrical aspect of it..otherwise ohm check the injector and look up the specs on Google.

I'm assuming you've pulled the injector to inspect it manually?

Have you tried swapping injectors around?