Question about 1991 Pontiac Bonneville
If you have this problem when accelerating, check in the engine...
-FreshAir Intake Hose for Clogged or Damaged FreshAir Intake Hose
If you have this problem when driving, check in the engine...
- Carburetor for Worn, Faulty or Damaged Carburetor.
- Mass Air Flow Sensor for Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
Other problems can find it in the Throttle Position Sensor, Idle Air Control Valve, Idle Speed Actuator or Idle Stop Solenoid.
Additionaly, I suggest make one scaning for review fault codes.
Hope thats help.
Posted on Feb 05, 2010
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Posted on Jan 02, 2017
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To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.
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