2001 Chevy Tahoe

Cleaning the throttle plate, located in the center of intake manifold, is always a good idea but your symptoms indicates the IAC (Idle air control) Valve might be at fault. Fuel injected engines should "flare" when started. This term means, when starting, with no pressure on the accelerator, the engines rpms should climb to approximately 1100 and come back to its normal idle. This "flare" is the computer (ECM) extending the plunger inside the IAC Valve. If this flare is not happening, the valve is most likely gummed up or not functioning properly. It is located on the throttle housing and cleaning the valve usually does not work.