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Originally Posted by jonbays
Yes very overactive knock sensor could do that by taking out 10 degrees advance.
Sometimes they hear "noise" and respond as if it was knocking or preignition and pull out all the advance. That would give the weird shape to your power run and kill the power too.
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That looks like a crappy bbm fault and is not changing over properly.Looks like its getting lazy..then patially closes then goes back and forward