'98 Dodge Neon Sport with back fire

I've got a '98 Dodge Neon Sport with a dohc 4cyl i just put a new timing belt on, the time is set right it has great fuel pressure but it wont stay running, when i do get it running, and it does a lot of backfiring and popping, what could be wrong with it?

My first guess would be the timing. Double check your timing marks. What is your fuel pressure? Should be 49psi. How are your spark plugs and wires?