Outboard help needed- yamaha 25

[chaz11bb]

The engine runs fine at idol and then the revs start to go up and down quickly once you give it some revs...
I have posted a video on youtube - link
YouTube - yamaha 25hp not running properly?
Thanks

[boats.net]

Probably need to remove and clean carbs and check entire fuel system for fuel restrictions in filters, hoses and pickup tube in gas tank.