1998 Volkswagen Jetta Random Misfiring code

1998 VOLKSWAGEN JETTA
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VWJOE
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Engine Performance problem
1998 Volkswagen Jetta 6 cyl Two Wheel Drive Automatic

It is misfiring on cylinders 3 and 5. code reader came up random misfiring code po3oo. can you help???. I've change out spark plugs, plug wires coil and still have issues.
Sep 4, 2009 at 4:59 AM
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RASMATAZ
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Engine misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
Sep 4, 2009 at 5:26 AM