Jeff Spitzer wrote:

After I deleted the question recently posted about the timing light a
little light went on in my head.  I think the problem may be that the
wasted spark is fooling your timing light to read double the actual RPM.
Therefore it thinks that the marks are twice as far apart as actual because
it thinks the engine is going twice as fast.  Does the timing light also
have RPM readout?

Jeff Spitzer

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