Question about 1999 Chevrolet Monte Carlo
Try unplugged the mass air flow sensor and see if that corrects the problem.It is located in the air induction tube between the throttle body and air box on the driverside.If this helps you you may need a maf.
Posted on Aug 30, 2010
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Posted on Jan 02, 2017
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Nov 13, 2013 | 2005 Chevrolet Monte Carlo
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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