[Old Henry]

I feel like I made a major breakthrough today in the mystery!

As I was driving home from the 3° in Boise today (not in Old Henry) the thought came to me, "What if the stumbling problem of the engine is not an ignition problem? (Several have suggested such and that the ignition problem is just a "red herring") How could I eliminate the ignition as a cause of the stumbling problem?" Then it came to me. It was such a simple idea I'm surprised no one ever suggested it. Here it is:

I would just unplug the wire from the spark plug of the offending #6 misfiring cylinder! If the engine smooths out - that would prove that the stumbling is being caused by that cylinder misfiring. But, if it does not smooth out - that would prove that the stumbling of the engine is caused by something other than the misfiring cylinder!

So . . . I did it. I started up the engine and checked with the timing light that #6 cylinder was misfiring. Then I unplugged the wire to #6 spark plug and let it just hang out in the air. Then I took off for a drive. Much to my surprise, the engine ran just as badly totally without cylinder #6 as it did with it, just a little less power is all. Otherwise - just as rough! After 10 miles I stopped and plugged #6 back in resulting in more power but no more or less stumbling. Another 10 miles unplugged it and another 10 miles plugged it back in with same result. Only the overall power level was affected - not the stumbling!

Is my conclusion accurate that such test eliminates the misfiring cylinder as the cause of the stumbling engine or am I missing something???