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I haven't touched the mixture screws because it was tuned fine the other day. Any thoughts?

What was done when it was tuned up? I'd shoot a 3 second blast of starting fluid into each idle mixture port & if still bad I'd take off the bowls & spray everything out & I'd spray around the carb base/intake & check for vac leaks

live every 24 hour block of time like it's your last day on earth