THose micro-switches on the throttle cams are really squirelly, so you might check those if you havn'te already found and fixed the problem. Mine was acting up and making a weird sound that was so strangely intermittent that for quite a while no one could tell what it really was. Finally I took it up with a mechanic aboard. At only that certain speed and configuration where this occured, he fished around in the cabing, finally crawled under the panel, and found that the weird sound was the gear horn! Just re-soldering the wires on the micro-switch fixed everything. This drove me nuts for about a month until we finallly found it as described.
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