deja vu !

[glynblue2]

When you say you have checked the plugs have you tried actually changing them? holding plugs onto a head and checking for a spark is NOT the way to check a plug is okay plus which have you checked the plug cap resistances,and also checking what colour the plugs are is a useless procedure if its not done correctly.as in its no use checking them when its been idling as there is a set procedure for checking plugs which is called a plug chop.