I have a 1999 hyundai
No ,,No fuse controling spark,,Your coil pack on top of motor could be cracked and causeing this or your fuel filter, or fuel pump, you could get a pressure test done to your pump at a garage,Check your spark plugs,change them if you can, change the fuel filter a good place to start,,,,,,,,,,,,Also is there a check engine lite on in the dash cluster? If so go to Auto Zone parts store and get a code scan done its free,,than they will give you a print out of the codes and what needs to be replaced,,most vehecles in the 90,s have or need 02 sensors that control your air fuel mixture,,,were talking gas mileage here.