Terry,
I sent my ignition in because one coil went bad. They replaced both and the wires and it still would not slow down until the plane was almost stalled.
ORIGINAL: TLH101
If it has a C&H Synchro Spark, could be the ignition is not retarting as it should be. Nay be the reason for both problems. You should call the guys at C&H and have a talk with them. They should be able to halp if it is an ignition problem. Easy poeple to deal with, and really helpful.
You can find the number here:
http://www.ch-ignitions.com/