Problem solved! Thanks to those who posted replies. It was the bend it the tone ring that was causing the problem. I wish that the resolution was better on my scope. I was unable to make out the effect on CPS signal as the problem occurred but obviously the sensor read the bent area as a gap and produced an errant signal, affecting the timing control only above 3,000rpm. I am going to go ahead and install the new sensor as the one in the car has a deteriorating housing. Special thanks to Art.
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Half efforts yeild half results
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