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If it is just falling on its face and refusing to rev at 3/4 or more throttle then it is likely too rich on the main jet. A plug chop during this condition will tell you for sure. If so, step down on the main and see how it behaves. If it shows itnis lean from said plug chop, obviously step up the main jet.
There is always a chance it could be the spark falling off. More details on what it is doing will make it easier to help figure out the issue.
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