handa civic missfire codes

[2.8broncoII]

i pulled the codes off of a honda civic today. Its a 1.6 and a 2000 model year. the codes say that there are missfires on the number 3 and 4 cylanders and there are random/multiple missfires detected. what do you guys think this is? plugs? wires? bad gasoline? clogged fuel injectors?
let me know what you think its kinda urgent.

 

[2.8broncoII]

oh yeah and code numbers are p0303, p0300, p0304, and p01399

 

[2.8broncoII]

turned out to be plugs and wires if anyone cares