avs air fuel adjustment screw

My Dart was running like crap and I finally took it to a carb guru. He ended up drilling out the lead and backing out the idle mixture screws. That carb design was the beginning of emission controls. Check out this thread; especially page two, I had an issue with those idle mixture screws some time ago. http://www.forabodiesonly.com/mopar/showthread.php?t=29582&highlight=rough