I have a 1971 Oliver 1955. On occasion the engine RPMs change without any adjustment to the throttle lever. This can happen while under constant load or just sitting. I believe it usually happens when the throttle lever is somewhere between 3/4 and wide open. When it happens, the engine will increase its speed abruptly by 200 to 500 RPMs and then drop back in speed anywhere from a couple of seconds to a minute. I?ve checked the linkages and they seem to be tight. Any help would be appreciated.
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