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1987 944 Turbo high idle

Engine

Vehicle Information: Model(924/944/968): 944 Turbo, 944 tURBO; Year: 1987; Body Type: Coupe; Total Mileage: 160,000;

My '87 Turbo has a huge idling problem. It seems it only does this when the engine has been running for a while. The idle will kick up to 2100 RPM's and stay there. Even when I am driving it, if I have it in gear and take my foot off of the gas, it will just drive when the tach gets down to 2100. It seems that it only does this when the volt meter is running low. It gets down to around 12. I don't know weather to change the idle stabilizer, or change the voltage regulator, or both???

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