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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 176,500 (100,000–253,000)
Engine affected: 5.0L V8
3 model years affected: 1990, 1991, 1999
6 people reported this problem
Viewing 1 - 2 of 2 comments
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 .