Engine Stalling and/or Hesitation on Acceleration due to Faulty Idle Air Bypass Valve on Ford Crown Victoria

If you experience difficulty starting the engine when cold, stalling at idle, or hesitations during acceleration, it may be the idle air bypass valve. This valve helps the vehicle idle steady when the accelerator pedal is not pressed.

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Average mileage: 176,500 (100,000–253,000)
Engine affected: 5.0L V8
3 model years affected: 1990, 1991, 1999
4 people reported this problem
2 people shared problem details
did not fix it yet cause i just found out what was causing this when i got on here but yes ,hesitate when taken off ,also hard two strart, also ruff idle.
air idle control went bad. Hard to start an idle n cold .
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