A pressure drop with rpm increase is more normal than you think and is discussed on several forums. So long as it doesn't dump too far down and or it recovers then all is good.
p.s.
The engine should never stumble with this decrease. If it does then there could be another real problem.
Roger Lee LSRM-A & Rotax Instructor & Rotax IRC Tucson, AZ Ryan Airfield (KRYN) 520-349-7056 Cell
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