Question about 2000 GMC New Sierra 1500

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99 GMC RUNS RUFF OF IDLE AFTER ENG BEEN TURNED OFF AFTER UP TO SPEED NO PROBLEMS REPLACED FUEL FILTER REPLACED BOOTH CAT. CONVER., CK FUEL PRESSURE AND REPLACED AIR FILTER NO HELP

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The I.A.C.(idle air control valve) is a common failure item. Hard to say exactly what it is because there are so many things that could cause it. But do some simple checking and look at the fuel cap, vacuum lines and vehicles maintenance history. If the plugs and wires are old they may be the cause.

Posted on May 14, 2009

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I assume that you have gave it a complete tune up, so try changing the fuel pressure regulator!!!!!!!

Posted on May 14, 2009

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Check the IAC .the idle air controller on the throttle body.

Posted on May 14, 2009

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