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I believe that was one of the last carburated vehicles around, wasn't it? If it's carburated you might need to adjust the choke a little to have it run better in the cold.

AnswerOn your vehicle's carb there is a choke pull which has the job of controlling the closed choke at start-up to the open choke at operating temperature. This may be the problem. The choke pull is attached to the choke blade and to test it a person attaches a hand held pump ( mity-vac) to test them. The pull should pull the the choke blade open just a little after start-up to keep the car running when it is colder out, and if yours is bad, it could cause exactly what you are writing about. Check this out.I hope this helps you. Mark

NOTE: This vehicle has automatic transmission and CFI ( central fuel injectors). Therefore, there is no choke and a computer regulates the fuel/air mixture as well as the idle speed. Since this stalling only happens in cold weather, would I be right if I concluded that the ECT (engine coolant temperature) sensor is sending a faulty signal to the computer that the engine is warm in cold weather, thereby, not increasing the gas in the fuel/air mixture when shifted into gear, causing the engine to stall?

AnswerGood News: I solved the problem by replacing the engine coolant temperature sensor and so far no stalling as low as 23 degrees F.
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Q: Why does a 1985 Mercury Marquis run in park but stall when shifted into gear with cold engine in cold weather but run OK in warm weather.Has central fuel injectors.?
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