Question about 2003 Chevrolet Impala
Clean out your throttle body, the IAC (idle air control) valve may be sticking from carbon build up. You can get a can of throttle body cleaner at Auto Zone or most auto parts store and follow the instruction on the can.
Make sure you use all of the can and you may want to do it twice with two cans of throttle body cleaner just get it all cleaned out. The IAC controls the amount of air enters the engine to get it started and to idle smoothly with the different loads. A stuck IAC valve will give issues to what you have described.
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Posted on Sep 08, 2010
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Posted on Jan 02, 2017
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