sneeze

I have a new to me Vmax1200 with the 4-4 Cobra Exhaust on it. I know...I know it sucks. I hate how it looks and sounds but it's what I got right now. Planning on a 4-1 full exhaust and an S7 or Muscle kit this winter. For now, I have an idle problem. It backfires and lean pops on the rear two...

So overnight, out of nowhere, the bike goes from idling perfectly at 1000 rpm to idling at 750-800 rpm, sounding a bit like it's running on 3 cylinders :ummm: Also, at times it still 'sneezes' at low revs, has been doing that forever even before and after the carbs rebuild. But now, I'm also...