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hi Kimbara
Just have a quick look at your fuel tank breather and make sure its not blocked. When it is playing up open the fuel cap and listen for air being drawn into it. Thats my first thought. When you drain the fuel filter next drain it into a glass jar and let it sit for a while, if there is water in it you should see some separation also as Robo said in could be an algae bug in the tank ,look for a blackist ring on the jar.
hope this helps
bazza