Question about 1992 Lexus Ls 400
Had the same problem with mine...replaced the fuel pump...worked like a charm...
Posted on Apr 17, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
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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