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1986 944 Rough running engine upon cold start.

Fuel System

Vehicle Information: Model(924/944): 944; Year: 1986; Engine (type, size, modifications): 2.5 L; Total Mileage: 105000;

My 1986 944 has issues when I attempt to cold start it at temps below 25 degrees. It starts up O.K. but then runs rough for up to two minutes, I normally would have to idle the car at approx 1000 to 1500 rpm to keep it running, I think it would die at normal idle. After two minutes everything is normal. I am getting normal (good) fuel economy and the car has normal power. Also, I purchased a set of factory manuals and find them quite useful but am looking for a reference book that would better describe the systems in my car, like what is the function of the temp sensor and how does it relate to the other systems in the car.

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