Hyundai Repair: fuel flow?, fuel pressure gage, hyundai tiberon

Question
I recently picked up a Hyundai tiberon  1998 4cyl.  Problem .....  every so often vehicle wont start. wants to but just wont fire.  after about 30 mins it will start. ans then run all day. mass airflow is new and have a K&N filter installed. Only fault that shows up on diagnostic is o2 sensor. can this stop igintion?

Answer
If I read this right an the car is turning over but is not starting ,What you're going to have to do is hook up a fuel pressure gage an also look for spark in the 30 min window you have to see this problem.then you can go from there no spark may be bad ground or a few things so I don't want to steer you to fare off the track dealer best way to go, An if you don't have fuel pressure can also be a bad ground fuel pump or one of many things that run the whole system, So not have you chasing your tail (haha) this is one with out being there an able to do the testing my self I would advise dealer help,they have all the right book an TSB's an they might know right off,OK have a great afternoon an hope some of what I said is some help