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347,
There are many things that could be causing it. I am assuming that your were using an Engine or Chassis Dyno at the time.
If so did the engine flat line or drop off at 6K?
If we are talking flat line three things that come to mind are fuel, ignition, not enough air.
It it drops it also could be springs too light and floating valves, lifters, etc.
Maybe if you post more information, others here can better help.
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