Welcome to Buggymasters
I bought our red 2005 dune 150 not running and it had a leaking intake boot and would not idle after it warmed up without the idle set really high, replaced the intake boot and it improved but still would stumble off idle unless you would puch the gas to the floor.
It also ran pretty bad all the time.
I later found the intake valve was bent when I removed the head to port it.
This buggy was run hard and looked like it had rolled over because some of the roll bars were new with the stickers still on them. And it had a bucket with damaged parts in the front seat with a old engine on the floor board that died from lack of oil.
You could have a slightly bent valve from over revving from the last owner.
Just my experiance so far with idle issues.
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