To find it, you'll need to:
1. Consult a repair manual: A Haynes or Chilton manual specific to your 1996 Pontiac Sunfire 2.2L will show you a diagram and pinpoint the location. This is the most reliable method.
2. Look near likely areas: Start by looking near the throttle body and intake manifold. Inspect wiring harnesses in this area; the solenoid will have a small electrical connector. Also check the firewall near the engine compartment.
3. Identify it visually: The EVAP purge solenoid is a small, usually black, cylindrical device with a single electrical connector and potentially a vacuum hose connected to it.
Important Note: Working on the EVAP system often involves working with fuel vapors which are flammable. Ensure the vehicle is turned off and that the area is well-ventilated before attempting to locate or service any parts of the EVAP system.