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Idle speed screw unresponsive

Engine

Vehicle Information: Year: 1976; Body Type: Targa;

I had my Porsche in for a cold start problem and in the course of troubleshooting the mechanic discovered that my idle adjustment screw had little effect on the idle speed of my engine. He tried shooting some carburetor cleaner into the screw hole followed by compressed air and got a little bit of adjustment back, but nothing like what it should be. What is the best way to clear this air passage?

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