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There can be quite a few causes, depending on what you mean by "high rpm".
Sometimes it's "valve float", that's where the valve springs aren't strong enough to return the valves to their closed position once the engine hits high rpm.
Sometimes it's a coil that can't cycle quickly enough to provide spark.
Sometimes it's low fuel pressure or a partially blocked fuel filter that restricts sufficient fuel from getting to the engine at high RPM.
The problems can be caused by fuel, electrical or physical problems, and you need to find out which. Start with a computer diagnostic scan. Better yet, check with the manufacturer and find out where "red line" is. If you're trying to run it past red line, expect it to "sputter".
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