Stalling at low rpm

[Carl]

So,

I did some diagnosis this afternoon. Here is what I did. I ran on a separate fuel tank with new fuel bypassing the racor - No change

I pulled a wire off one at a time starting with 1-3-5. Pulling 1 and 3 made the idle slow and almost stall. Pulling 3 did nothing - no change. I did the same on the port bank 2-4-6. #2 wire was broken at the coil, but the coil was sparking like crazy without the wire attached (the only coil that did that). #4 wire was the only wire that provided some volts into my fingers as I pulled it off, but did affect the idle. #6 wire also affected the idle.

Since I have at least 1 bad (broken wire) I will replace all 6 and re-test. Could there also be some coil issues?

Spare - I'm confident I can rebuild the carbs, but what does a "good sync and link" mean? Is that something in a manual or more of a feel and hear of a good mechanic?