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Re: throttle body on 2001 tahoe
Do this.Remove the air tube from the throttle body.Get some carburator cleaner or equivalent.With one hand,open the throttle,at the same time spray the throttle plate with the cleaner.Clean it well.You might get a missfire for a little while when you start the engine.IT will clear out.This will do the trick.
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High idle speed is usually caused by a sticking idle air control valve or a vac leak. The computer controls idle speed by how much air is allowed into the intake manifold. is the check engine light on ?
The throttle body needs cleaned its gumed up.Take throttle body off and spray and wipe the inside of the throttle body with a can of throttle body cleaner this should free it up.If that didn't help then you need a throttle position sensor.Reset the computer after any sensor is changed.
I would spray some WD-40 on the throttle cable, also, you may need to clean the throttle body and throttle plate, sometimes there will be some carbon build up that will make the throttle plate stick in the throttle body, Gumout and an old toothbrush works good.
SOUNDS LIKE A THROTTLE BODY PROBLEM... CHANGE THE THROTTLE BODY AND YOUR AIR FILTER.... IF ITS NOT THAT THERE IS A SCREW ON YOUR THROTTLE BODY IF SCREW IS COMPLATELY DOWN TAKE A PHILIPS SCREW DRIVER AND OPEN IT ....
Buy a can of Throttle body cleaner and follow the instructions on the can, make sure you buy Throttle body cleaner. Carburetor cleaner is to corrosive to the gaskets used in the Throttle body's. The basic way to use the Throttle body cleaner is to just spray it into the Throttle body, working the Throttle blade and making sure that you also clean the Idle Air Control passage ways. As long as you follow the instructions on the can, you will have no problems. Just note that different Throttle body cleaner products will have different instructions, so read before you use. Just pay attention to the throttle blade, it's common for Carbon to build and can cause the blade to stick from time to time.
Pull the rubber inlet hose off at the throttle body and check for carbon build up around edge of throttle plate.USE a old toothbrush and some spray throttle body cleaner that can be purchased at autozone or othertype of parts house. Hold plate open spray and scrub with brush front,back and edges also make sure the idle air bleed hole on plate is open.
I have a 2K1 Tahoe that was doing the same thing. It wouldn't idle properly and would die at stop lights. The check engine light would come on once in a while for a few seconds. I took it to a dealer and they removed and cleaned the soot like residue and other build up from the throttle body. That fixed the problem and I haven't had any problems since then. Hope this helps.