Idling trouble

[jackson1995]

Hi guys,

Got a probably with my bike, when idling the two ride side(3/4)  cylinders are not running , once riding about 2500rpm it fires on all 4 ,
Things I've checked...
Spark , yes
Fuel , yes
Throttle cable slack
Air filter
Coils
Throttle position sensor
Starter diode
Pickups
Kill switches
Side stand
Float bowl fuel level
Butterfly's
Vacuum balancing
New plugs
New caps
Carbs have been apart
Diaframs are good,

So saying all that any ideas? I'm stumped haha
You can literally sit at a red light and pull the lead of the plug and bo change to idle.

Any more ideas will help!
Thanks guys