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1984 911 Carrera Idle Surge

Engine

Vehicle Information: Model: 911; Year: 1984; Body Type: Targa; Engine (type, size, modifications): 3.2; Total Mileage: 118000;

After my car has warmed up, the idle begins to waver when the car is sitting still. The rpm meter will move up and down between 900-1500. The car does this only after it has been running for a while. there is no problem with overheating and the car does not smoke. What could possibly be causing this and how can it be fixed??

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