Car runs rough and dies on 2000 Hyundai Tiburon

Runs rough and dies. Check engine light comes on and goes off. WE had fuel system cleaned and ran good for a day. Replaced fuel filter and still no better. What could it be?

2 answers
mine was sort of doing the same thing. do u ever have any trouble starting it? if so i would take a look at the crank positioning sensor or even the cam position sensor
What is the code that is causing the light to come on? This will be a huge clue as to what may be causing the problem.