First, have fun on your vacation.
Second, the symptoms you are describing sure do seem like a spark /
Two other items to check are:
(a). the plug wire end where it grips onto the top of the plug electrode.
Make sure thats tight.
(b). plug wires can break internally, and have only intermittent contact,
passing juice to the plug only at random. While you haveth flywheel off
again to look at the electronic module, use a continuity checker / multi
meter to make sure that the plug wire hasn't died the death of a billon
You being a double E, you know what a pain intermittent continuity problems
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