Ford Crown Victoria Problem Report
Ford Crown Victoria Engine Stalling and/or Hesitation on Acceleration due to Faulty Idle Air Bypass Valve
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.
air idle control went bad. Hard to start an idle n cold . - Visitor
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. - dstone
The throttle position sensor (TPS) may fail. Common symptoms of a defective TPS can be rough id...
Just bought the car a couple of weeks ago. The car idles just fine and drives around town fine...
After engine gets to normal operating temperature, I get rough engine running at about 30 mph....