Question about 2003 Ford Crown Victoria

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When I start to go the car goes but if I punch it or just put the pedal down a ways it starts to sputterish. When in park and push the pedal down, even slowly, it sounds like the engine is up, down, up, down consistantly.

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Is the check engine light on?

I would first inspect the air filter, change it if it appears to be dirty.

Next, I would check the fuel rail pressure with the vehicle running at approx. 2000 rpm. If the pressure doesn't stay around atleast 40 psi I would change the fuel filter, if that doesn't increase the psi then I would check the fuel pump and relay.

Then I would change the spark plugs.

If that doesn't fix the problem you will need to start checking the ignition system and the sensors.

Post your results.

Posted on Mar 11, 2011

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Posted on Jan 02, 2017

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IF it does NOT have the hydroboost system the following steps MAY help diagnose if it's a booster problem.

(Copied and pasted from a youtube comment)

Test 1) 1. Start the car 2. Let it idle for 2 minutes 3. After 2 minutes turn off the car 4. Pump the brake pedal 3 times 5. The pedal should rise every time if it does then the Booster and Check valve are OK 6. If the pedal doesn't then the is an issue with the either one, run tests 1 and 2.

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