Too high of an idle could be producing too much fuel for your jets to work with
Bad spark plug, or dirty carb.
A bad spark plug or spark plug wire can cause your Kawasaki engine to miss at high rpm's. A dirty fuel filter can also cause the engine to miss.
This may be the indication of a spark plug miss.
Engine miss.
There could be many reasons, a vacuum leak is one possibility.
could need a good tune up sounds like it has a miss
You should check the timing and plugs.
A miss, black smoke and a strong gas smell. Also, bad acceleration, rough idling, and stalling.
A miss or A collapsed engine mount or A imbalance caused by a failing component, harmonic balancers and torque converters are common.
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asuming its a blazer around the majority of the others on this site a pluged fuel injector or a spark plug wire is rubbed and touching a ground point
It may be a EGR valve issue. This valve is normally closed at idle and opens at about 40mph.