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Sounds like the throttle body might be gumming up thus causing your butterfly valve or choke to be positioned off a little. This will cause the computer to deliver more fuel and then lessen the fuel before it floods out repeatedly. thus causing the surging in RPM's. I had this problem on my 92' . What I did was but some throttle body/choke cleaner and use it is directed. A immediatly saw sludge run out of the intake and my surging was cleared. -Good luck
 
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