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2000 Mercury Sable Engine runs rough when cold

Tiny
NANAJ
  • MEMBER
  • 2000 MERCURY SABLE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
My daughter's car runs very rough & stalls at start-up. It gets better after it warms up. A mechanic told us the engine code indicated a gross vacumm leak. He replaced all vacuum hoses and the air filter. It didn't help. Any idea what the problem could be?
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Monday, November 1st, 2010 AT 1:54 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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. Manifold absolute pressure sensor
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Tuesday, November 2nd, 2010 AT 1:40 AM

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