Question about 1999 Lexus Gs 300
Have you tried to replace the fuel filter? Had this problem on my Ford. Went nuts trying to figure it out, til my dad told me what to do. That was it. I hope this helps
Posted on Dec 30, 2010
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Posted on Jan 02, 2017
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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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