Question about 2005 Chevrolet Trailblazer Ext
Hello and welcome. this is usually caused by a dirty throttle body. remove the air box from the top of engine that is attached to the throttle body. clean out the inside of throttle body around the throttle plate and bore with some carb cleaner or throttle body cleaner. in most cases this will correct the problem
Posted on Nov 06, 2010
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Posted on Jan 02, 2017
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This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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