2003 Hyundai Accent po300 01/03 code

2003 HYUNDAI ACCENT
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CLIFF52
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Computer problem
2003 Hyundai Accent 4 cyl Front Wheel Drive Manual 54.000 miles

the code po300 01/03 code has shown up ive changed wires and spark plugs and cranksenor and code still will pop up a couple of weeks down the road can it be the timming belt
Oct 10, 2010 at 10:17 AM
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RASMATAZ
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Engine running rough or misfiring can be cause by the following:

1.Defective spark plug
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
Oct 10, 2010 at 3:10 PM