Help me in 2002 sonata gls 2.0

I brought 2002 hyundai sonata 2.0 gls second hand 60miles.
now got problem. can help me solute?
the car ran rough and keep sputter and die in the middle on the road when i driving.
i repair few time but still same...spend a lot money on it already

Did you do an ODB II code scan? What "fixes" were done? Why didn't the mechanic guarantee the work? Are you in the US? US Sonatas come with a 2.4L engine.