Misfire on k4 gsxr1000

Guys after some advise k4 gsxr1000 has developed what I believe to be misfire on cylinder 3 bike runs fine full power but the plug was sooted up also you can hear a ticking from cylinder 3 also if you put your hand over the throttle body of cylinder 3 you can feel it miss or backfire any ideas would be very grateful the misfire isn’t all the time intermittent