Toyota Camry is unstable when it is ignited in the cold morning.

Normal, because the engine oil does not completely lubricate the cylinder block in cold weather, and the unstable factors are relatively large, so it is necessary to keep a high idle speed to avoid flameout. When the oil comes up, the temperature is high and the friction is stable, so it naturally comes down. In addition, you must turn off the air conditioner and everything before turning off the engine, otherwise this will happen.