how can i fix the cars hesitation

1991 SUBARU LIBERTY
180,000 MILES
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DYLAN487
  • MEMBER
  • 1 POST
i have replaced fuel filter
Oct 21, 2011 at 6:55 AM
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RASMATAZ
  • Experienced Mechanic
  • 75,992 POSTS
Could be caused by 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.
Oct 26, 2011 at 4:39 AM
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