If it's the solenoid on the front of the carb then it's the idle solenoid.
It's normally controlled by the MCU to increase your RPM's a few hundred under certain conditions. It's fed by the MCU (behind the glove box wich in turn passes the signal thru the diode/fuze assembly and then on to the idle solenoid. The idle solenoid also has a vacuum hose going to it too.
I the soenoid you are referring to is on the back of the carb then it's the stepper motor. It's wired directly to the MCU behind the glove box.
You can get on-line schematics at the Autozone website.
Drill down in the "Repair Info" section on the left to get them.