Flutter below 2k rpm

mbaird said

I am somewhat familiar with plug reading but its kind of an art .
There are about 1000 miles on the plugs.
As far as running lean my Wideband show me between 12.5 and 15.5 at the leanest. Most low speed cruising is around 13.5

The QF 750 VS I was running had it so rich I had to wipe down the rear bumper !

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I dont care what your meter say's or what your bumper looks like those plugs are way lean for my taste.
Again research plug reading and see for your self.
I know when I got it right the plugs are a light toasty brown, timing mark is toward the bend of the strap.
And yes a lean condition can cause a miss as you describe.
I just went thru all this with my built 340.