(po306 only)rough idle after warmed up,good accelaration & off idle preformance

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new plugs,wire's,coil pack,02 sensor,isc motor.good compression vacuum steady at 18 motor has valve train noise after warmed up changed rocker arms & push rods on #4,#5,#6 head motor runs & sounds 50% better code po306 came back after one day.the motor dose not over heat no back firing motor will spin the tires.Question will the code po306 set if cylinder #2 is miss firing since coil pack fires both cylinder #2 & #6 at the same time