same problems with mine

I have a 98 jeep grand limited 5.9L.I am having the same problems with mine.i took it to a friends house that has a scanner and it was saying there was a cylinder 3 misfire.i had changed the spark plus not to long ago but i got the firing order and sure enough the spark plug on #3 was red looking and looked a little burnt.replaced and it ran good,then it happened again.same spark plug,its a temp fix but there is a deeper problem,still looking for it.will post when i find it.