95 toyota 4runner v6 has rough idle when starting in cold weather?

[knsr50]

my 4runner has rough idle when i start in cold weather (60 degree F or less), but the rough idle only lasts only a few seconds (20 to 30). i researched the problem and i think its a sensor. the engine has 2 temperature sensors, one is called the coolant temperature sensor and the other is called the temperature switch. if the problem is the sensor, my question is which sensor needs to be replaced. in warm weather i dont get a rough idle, so i think the faulty sensor controls the cold start valve. any info on this problem will be much appreciated. suki p.s. oh by the way, are the sensors hard to locate and change