I don't see any burn marks, but there is a crack along the raised part (see pic).
The boot looks fine.
I narrowed it down by pulling the plug on each injector one at a time. The one that didn't make a difference is the one that I'm assuming has a bad coil. But like I said before, it could also be the injector somehow. I'm planning to listen to the injectors tomorrow and see if they all make clicking noises.
I don't have a CEL, but I didn't check for hidden codes either.
Thanks for the help!