2001 Audi TT Question engine missing

2001 AUDI TT
120,000 MILES • 4 CYL • AWD • MANUAL
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APRIL MORGAN
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  • 1 POST
i replaced new plugs replaced with new coils replaced new o2 censors and new catylate converter what am i missing i need help
Aug 29, 2010 at 2:47 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
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.
10.Throttle position sensor.
11.Idle air control valve.
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Aug 30, 2010 at 2:41 AM
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