Silverado Stalling at Idle

I had a similar problem with my Silverado. Stalling at idle, check engine light – sounds familiar. Did you check the throttle body? It could be all gunked up with carbon deposits. That messes with the airflow at low speeds and can cause the engine to stall. When they get a buildup of deposits around the throttle plate, it restricts airflow. The idle air control valve tries to compensate, but if the buildup is bad enough, it can't keep the engine running.

Throttle body, huh? Where exactly is that and is it something I could clean myself?

The throttle body is located between the air intake and the intake manifold. Cleaning it yourself is possible, but you need to be careful. You'll need to disconnect the battery, remove the air intake, and then use a special throttle body cleaner and a soft brush to clean the throttle plate and the bore. However, if you're not comfortable doing that, or if the problem persists after cleaning, I'd recommend taking it to a workshop. A contaminated intake manifold could also be the source, and it is harder to check. They'll be able to diagnose the issue properly and ensure everything is working as it should.

Thanks for the advice! I took it to a mechanic, and you were right, the intake was heavily contaminated. Replacing the idle air control valve and cleaning everything set me back 425€, but the engine runs great now!