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Erratic Idle

Engine

Model: 911 Carrera, Year:1985, Mileage:150K, Type of use:Street use only
I am experiencing on occasion a drop in idle speed both when cold and hot. It started when I had the "O" ring replaced on the oil thermostat. The mechanic suspects that because he had to remove some electrical connections to get to the thermostat he noticed some of the connections were corroded. His solution is to remove all the electrical connections and clean the contacts. Do you have any thoughts?

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