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1996 993 Short Idle Increase

Engine

Vehicle Information: Year: 1996; Body Type: Coupe; Total Mileage: 72,000;

After coming to a stop (after decelaration - vacuum condition), about 40% of the time my engine will run-up to about 1200rpm and then drop back to idle. Everthing else appears to be nominal. I purchased the vehicle 6 months ago (this has been the condition since I purchased) I consided pulling the ISV and cleaning? Any advice on where to begin and how to proceed would be helpful, thanks!

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