Misfire Module B

Lets see if I can add a pic link here

 Well, it looks like something common to both plugs in the same cylinder which tends to rule out the electrical side of the equation.

I am guessing you have replaced the plugs because the threads should be very White from the coating of Heat Sink compound that does NOT appear to be on them. ???

What sounds like a miss might actually be Early Ignition/Detonation from a Hot Plug that is blowing the soot off the plug.

Is there Heat Sink Grease on the threads that just doesn't show in the photo?

Yes, there is heat sink paste on the threads.  Thank you for sticking with me on this.  I did a couple pf things. I pulled the right intake manifold and checked the o ring seals.  Both were good.  I also checked the alignment of the carb piston just to make sure that it was aligned by the diaphragm tab was doing its job.  Not sure where to go next.........Tom 

It just doesn't make sense to me.  You are right, electrical is virtually ruled out, but how can cyl #1 look sooty (plenty of fuel), and #3 be dry and running lean?  After the start and warm up I tried to do the ignition test.  I had a difficult time getting the rpms up to 4K.  At about 3400 is got so rough and I had to add significant throttle to get it to move. It was actually falling on its face. Finally when I did get the rpm up, the ignition check was pretty good, so I took off and flew it thinking that I had a fouled plug from the long warm up. But I decided to pull the plugs and to take a look, just to verify....Tom  

Just throwing out ideas to see which ones might stick.

Let's consider a leaking intake manifold at the #3 cylinder.

It leaks air until things heat up, expand, and seal.

There might be a hidden fracture somewhere.

Spray some brake cleaner on the area when it is running rough.

Any change, Better or Worse, indicates the fluid is making it to the cylinder.