1989 Carb LX. Air Temperature Sensor problem.

When it's unplugged car runs very well. When I plug it back engine start to shake and jerk randomly. With unplugged sensor car runs very well on hot day but on colder days mixture is getting little bit too rich. No black smoke but I can smell it. Air sensor is connected to emission control unit but what exactly this sensor changes. What relay pump solenoid it controls? And yes I tried different sensor. And I tested them both. They are both in specs. Any idea? Thanks