Carburetor throttle solenoids and idle stop solenoids are used to reduce idle RPM to prevent engine run-on when ignition key is turned off. They also were used to increase idle RPM when the A/C was turned on to prevent stalling. Dash pots slowed the closure rate when throttle was released quickly. These carburetor parts are no longer manufactured and are getting hard to find. Many rare and hard to find NOS and vintage aftermarket parts. Quantities limited.