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1994 968 Rough Idle at 1st Startup

Fuel System

Vehicle Information: Model(924/944/968): 968; Year: 1994; Body Type: Coupe; Total Mileage: 50000;

After my car sits overnight, I get a rough, stumbling idle when first starting. It sometimes stalls but usually can be kept running with a bit of throttle. This lasts less than a minute and then it smooths out. Subsequent starts throughout the day are OK. Where should I be looking?Also the fuel pump makes quite a noticable buzz at times, usually after starting, but not always, and then is its normal self, often for a few days. When it does make noise, it may do so for an hour or more. Should I be doing anything about this?

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