Question about 2003 Lexus Gs 300
Low idle can be caused by many things, Air filter, spark pulgs, fuel filter, just plane bad gas. First thing would be to check the air filter. look at the rear of the car, do you have a blackish dust at the bumper around the muffler? That is a air filter thing. Not sure about an idle air control. If you do not have a check engine light on, most likely you do not have a bad engine control. Check the air filter.
Posted on Sep 10, 2009
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Posted on Jan 02, 2017
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Oct 06, 2013 | Buick Cars & Trucks
Engine stall or RPM fluctuates
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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