ENGINE RUNS ROUGH WHEN COLD

2000 Mercury Sable

Tiny

nanaj

November, 1, 2010 AT 1:54 PM

Engine Performance problem
2000 Mercury Sable 6 cyl Two Wheel Drive Automatic 130000 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?

FOUND 4235 RELATED QUESTIONS

Running Rough

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1 Answer

Tiny

rasmataz

November, 2, 2010 AT 1:40 AM

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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