bktrub@aol.com wrote:
> This was at any altitude- I'll take off at sea level  and on climb out
> if the rpms get to 6100, the engine stumbles as if it were suddenly way
> too lean. So, what I'm saying is that this can happen at any altitude.
> It seems to be more of a RPM issue than of manifold pressure.
>  
> As far as the EGT goes, it may be an instrumentation error.
>  
> I've tried to richen up the mixture and then go up past 6100 rpm, but I
> still get the power drop.
>  
> And yes, I have the EM2 set at the factory setting for engine max power,
> so all I'm seeing is just an arbitrary number.
>  
> So, I'm going to change spark plugs and do some more flying. The weather
> is nice out here for the next few days so I have some opportunity to
> fully explore what's going on.
>  

These symptoms could all be explained by the coils not being able to keep up, 
including the EGT anomaly.  It could also
be an issue with a trigger wheel that isn't able to keep up.

What coils are you using?  Do you have any way of increasing the power that is 
reaching them (increase voltage? remove
supply resistance by shortening the supply and ground paths, or increasing the 
wire gauge?)

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