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['85 GSL]

Hi, I'm new to this forum and I just bought a 1985 RX-7 GSL. I had a few questions about it because I don't know much about rotary engines yet. My first question is: my idle speed is running at around 1500 rpms and I know that's too high. So I was just wondering how I can fix that? My second question is: when I try to rev my engine sometimes, it will drop rpm's right away before going up. What would be the cause of that?
Thanks!