1998 sportage starts fine and idles smoothly. When I rev the engine in park, it misses, similar to when older carbuerated vehicles would get water in the float bowl. During acceleration, it misses badly, and even sputters or pops slightly. I thought maybe a cylinder wasn't firing. I pulled the plugs and inspected them and they all appeared to be burning cleanly. No black residue or carbon. Nice clean looking electrodes. Correct me if I'm wrong, but since it idles smooth and the plugs look good, I don't think there is a cylinder missing. Which leads me to think that the misfire and rough running is somehow related to fuel mixture. Anyone have any ideas? I haven't checked the fuel filter? Could this be the culprit? How about fuel pressure? How sensitive is the fuel injection system to fuel pressure, or drop in pressure? Thanks.