Question about 2003 GMC Sierra 1500
Its a 2003; 104,000 miles. it has a rought idle and then it boggs out and shuts off. would it be the plugs and wires or somthing like that?
Also try to clean build up from around the throttle plate in the throttle body, should make it idle smoother.
Posted on Jun 03, 2009
I would start with changing the plugs, especially if they are original. If doing yourself, make sure to use anti-seize on threads of new plugs, gap plugs to manufacturer specs, and properly torque plugs to manufacturer specs.
Also, if it has been sitting for a while, change fuel filter, oil, and top off with fresh gas.
Posted on May 18, 2009
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Posted on Jan 02, 2017
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The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the side of the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed.
Do not attempt to clean the IAC valve. Carburetor tune-up cleaners or any type of solvent cleaners will damage the internal components of the valve.
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