Hi guys. I am experiencing a misfire at idle. The car idle smoothly in drive waiting at a light and then slowly it will start to idle a bit more uneven and then it starts to misfire. I have narrowed down to #5 cylinder. I checked all the plugs and this one is black and sooty. All others are clean. Ignition wires are new, I replaced the spark plug and distributor cap. Can the rotor be an issue? Any comments or suggestions?



Thanks