01 yz250 sporatic power burst

In first gear if you open the throttle at about quarter to half open and hold it there it starts have sporatic burst of power. Enough power to spin the tire. The burst only last for a second then goes back to normal power for the throttle position for a second. It keeps doing these random power burst until you let off the throttle and just let it idle. It idles fine and it just has these burst of power that makes it not ridable. only thing on it thats not stock is the boyesen carbon fiber reeds.  Im at a loss here any info or ideas would help a lot.

So further investigation on the werd power burst.  It only dose it in first gear, second gear and up are all smooth.  Idle dose have a little random high burst also if you sit there and really listen for it.

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