webster72n wrote:

If the ignition system were failing, shouldn't the symptoms be constant
instead of the unpredictable infrequency it shows?

Not at all - ignition problems can be very intermittent. Various
environmental factors (temperature, humidity etc) can affect the
developed voltage, and the ability to generate a sufficient spark.


In any event, I will check the voltage output of the ignition module.
No problem - I think.
For the rest of the story, please have a look at my last reply to John.

I wouldn't rule out oil quality at this stage, but I'd want to be sure
the ignition was working 100% before digging deeper.


Thanks for your readyness to help beyond expectations.

You're welcome.


--
Grunff