Hi jsanseverino, and welcome to AF
Sorry to hear you are having problems. Can you tell us which sort of S4 you have (country and network will probably be enough)? You'll get your best help in the device forum, but because there are differences between say a Verizon S4 and and international GSM model we have separate All Things Root forums for those. If you can tell us which model you have we can get the thread moved in order to get you the best advice.
I think you are probably right that you restored something incompatible from Titanium. What I don't understand is why you can't get into recovery. However, I don't know Samsungs, which is why I think it's best we seek help from other owners.