Exclamation [Q] Flashed rom on sprint galaxy S4, now nothing works

Hi all, this is my first time posting on this site, though ive been reading things on here for years now as a guest. I hope this is the right forum to post this, I apologize if its not.

Ive never had this trouble flashing a rom before on my old phones. Ive got an sph-l720 galaxy s4 from sprint, it was running 4.3. I successfully rooted it and installed CWM. I had just activated the phone everything was working. I flashed a rom called "Darth Stalker". Once it was installed everything appeared to work. But it turned out the only thing that did was wifi. No data, I could receive texts but if I tried to reply Id get error code 0.
I tried to restore my nandroid and it keeps failing on restoring /system. Any ideas what the hell is going on here??