Need some help truck is idling funny

[KING Z28 HAWK]

When its in park its fine but as I drop it into gear idle goes down sometimes it will die out on me. It also will do the same thing while driving if I get off the gas to come to a stop it will idle down really low want to die then rpms will go back up to normal. Anybody know why this would happen? Any help will be appreciated. Thanks!
Truck is a 2003 Sierra

[ame]http://www.youtube.com/watch?v=kySKtLaFLfQ[/ame]

[ame]http://www.youtube.com/watch?v=bhhuGOikBqA&feature=channel[/ame]

[Cutlass]

Clean the throttle body

#04-06-04-040: Idle Instability, Low or Rough Idle with Electronic Throttle Control (Clean Throttle Body) - (Jun 14, 2004)

Subject: Idle Instability, Low or Rough Idle with Electronic Throttle Control (Clean Throttle Body)

Models: 2002-2003 Cadillac Escalade, Escalade EXT
2000-2003 Chevrolet Silverado, Suburban, Tahoe
2002-2003 Chevrolet Avalanche
2000-2003 GMC Sierra, Yukon, Yukon XL
2003 Hummer H2
with 4.8L, 5.3L or 6.0L V8 Engine (VINs V, T, Z, N, U - RPOs LR4, LM7, L59, LQ9, LQ4)
and Electronic Throttle Control

Condition

Some owners may comment on an idle instability, low idle speed or rough idle.
Cause

Condition may be caused by deposits in the throttle body bore.
Correction

Clean throttle body bore and throttle valve plate of carbon using a shop rag and an appropriate cleaner. Refer to Engine Controls Repair Procedures - Throttle Body Cleaning Procedure. This procedure may be performed at any mileage necessary. Check to determine if the PCM calibration has been previously updated to one that includes the update for throttle body coking. For 2003 model year vehicles, look in the operating system portion of the calibration. For 2000-2002 model year vehicles, look in the engine portion of the calibration. If not, then update the PCM calibration to the latest calibration.

[Smittro]

Also a problem in the 08 Colorado 4cyl. models...

[KING Z28 HAWK]

Thanks guys will give that a try