Won't Idle

1983 GPZ 1100, Starts good, runs good, will not idle or run below 2500 RPM. No fault codes displayed. It just dies. Otherwise runs great. Any ideas?

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I have same problem

I have same problem, it just seems to stall unless I keep Revs up. I had a major fuel leak during winter and this caused a leak into air filter and this ruined the gasket. I wonder whether I am getting too much air flow as a result?