2003 Ford Focus • 4 cylinder • 100,000 miles

What causes your car to pulsate when pressing down on the gas. Only going away once the car is warmed up. Ford Focus.2003. What kind of price am I looking at to repair this?
April 9, 2011.

Dunno the costs it varies with location could be one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note: If it doesn't apply disregard it and keep testing

Apr 9, 2011.