96 jetta wont start, after extensive work

heres my story, simple as it may seem. My heater core hoses popped off, so i replaced them, while i was under the hood, i added a new gasket for the main coolent line, changed the feul pump relay, changed my thermostat, and tightened my steering belt. It will turn over, but not start... its getting feul and spark... im stumped:banghead: