2002 kis sportage misfiring, p0300-p0304-p0303, if this just started over night? what could be the cause?

2002 KIA SPORTAGE
123,000 MILES
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KCGILCHRIST
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lack of exceleration, pops or back fires under engine while driving, has no HP going up hills from dead stop? ran diagnostics, came up with the codes listed above? whats going on?
Oct 21, 2011 at 3:08 PM
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RASMATAZ
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https://www.2carpros.com/articles/engine-misfires-or-runs-rough

1.Defective spark plugs

2.Inadequate spark/coil,defective spark plug wire.

3.Lack of compression

4.False air leakage.

5.Faulty fuel injectors.

6.Insufficient fuel pressure.

7.Contaminated fuel.

8.EGR valve that is leaking.

9.Oxygen sensors.

10.Throttle position sensor.

11.Manifold absolute pressure sensor

12.Mass Airflow Sensor

13.Idle air control valve


Note: If it doesn't apply disregard it-
Oct 26, 2011 at 11:45 AM
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