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83 911sc idle

Engine

Vehicle Information: Model: 911 sc; Year: 1983; Body Type: Convertible; Total Mileage: 97000;

Just recently my 911 has been idling funny. Upon cold starts it idles around 800 rpm then after about 5 min it starts to surge up and down to about 1200 rpm and back down. After it warms up it seems to be back to normal @ 900 rpm. After I drive and turn the car off, not even after 1 minute, the whole pattern seems to happen again... What can this be? Don't even know where to start? Vacuum leak?

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