Is it a bad Voltage Regulator??

How do you know the problem is the charging system?

Last week I had my Wideband Air/Fuel on my car doing some on the road testing.. after driving it for a while, it started running like crap especially at idle..
if I wouldn't have had the air /fuel meter on it, I would have sworn the ignition system was dieing. Popping, spitting, bucking .
But I could see that the left bank was leaning out ( extremely) 19:1 at idle.

Had some crud make it's way into the carb, disassembled, cleaned it with compressed air and all is good in the world again

FYI