99 Sportage missfiring studders and general lack of power

Tiny
LOADDER
  • 1999 KIA

2 months back started to studder and skip, check lite came on, I had it checked, they said missfire in #4 and o2 sensor, I figured plugs were old, I replaced them and all was good for 2 weeks, then same problem occured, I then replaced the coil for #4 and was good for 2 days, now its back and seems to be worse, does anyone know what this problem is? And where I should go from here?
fuel filter?
or relay?
or?

help please 108000 miles on 1999 kia sportage

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Wednesday, November 8th, 2006 AT 5:23 PM

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