First time carb sync and then this happened??

Not an expert, but I would check to see if one of the vacuum hoses became disconnected.   Check the security of the bolts holding the cables.  Also, one of the carbs has a throttle position sensor on it, and you probably want to adjust the other carb cable. Right or left depends on perspective.  Looking from the engine towards the prop, the TPS is on my left carb.

Hey Chris,

I'm assuming by vacuum hoses you are referring to the CarbMate hoses. Yes I looked them over but also realized if one of them was loose or damaged that the indication on the CarbMate would have changed dramatically. It did not change. I did look over the cable connections and throttle movement through the entire range on both carbs and it was proper and equal. I don't think I have a TPS (912ULS). I guess I need to do a little studying to make a plan on troubleshooting the ignition systems. But it does make more sense that it would be in the fuel system since that's what I was working on. I just don't see anything though. Weird. 

You said the carb bowl's were full, that's an indication of flooding as they should be half full. Look for bad floats or needle valve leaking. Keep an open mind.

Hi Sam,

I suppose misleading but by full I meant to say full to normal which in my experience is probably more than half full. They were not spilling over when I removed them. I have seen them spilling over before. Last fall I had a fuel contamination issue that caused flooded carbs. They looked ok yesterday I think. It was so sudden. The rpm change. You're right though. I need to remain open minded. And a good part of the running up to that point was pretty rough until that last adjustment that smoothed it out. Maybe that roughness caused a carb issue like we are discussing. 

I pulled and checked each spark plug today. Some were wet and all were a little dirty. Cleaned each one and verified good spark gap. Also pulled bowls, dumped dry, and weighed floats. They were good. Started it back up and the sync was way out. Back in the opposite direction that I had to adjust before. So I'm wondering if maybe I adjusted it before with the carb bowl level higher than it should have been. Either way it ran fine today and I warmed it up and got it synced in perfectly. Taxi tested. Looked good so I put about 45 minutes on it and seems to be running great. Tomorrow is another fly day! Thanks Chris and Sam for your advice.