Because the exact location can vary slightly depending on the specific Suburban model and any aftermarket modifications, you might need to:
1. Consult your vehicle's repair manual: This will provide the most accurate location for your specific vehicle.
2. Look closely at the air intake system: Carefully inspect the tubing and ducting between the air filter and the throttle body. The sensor is often mounted directly on the intake tubing or in a small bracket attached to it.
3. Trace the wiring harness: Follow the wiring harness from the engine's computer (ECM) towards the intake. The harness should lead directly to the IAT sensor.
If you're having trouble locating it, a picture of your engine bay could help someone more familiar with the 454's layout pinpoint it.