Hi Jody
What actually was wrong with it ? ,you certainly got your act together getting it repaired,
as for the flat spot I had an mc 18 with exactly that issue,i sonic cleaned the carbs and raised the *et sizes it helped the problem but never cured it fully,mc 18,s often mess around with carburation 1 I had used to rev its nuts off on startup and the after several seconds it would settle down perfectly ok,hope you get to the bottom of it,
jonmac,
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John