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1999 Ford Escort Missing and Skipping

Tiny
WILLIAM PENN 09
  • MEMBER
  • 1999 FORD ESCORT
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 138,000 MILES
I have had the Idle Air Control replaced and the fuel filter replaced, and the car still misses and skips> What should check next?
Thanks for your help
Tuesday, March 3rd, 2009 AT 2:01 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be caused by the following:

Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
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Tuesday, March 3rd, 2009 AT 2:05 PM

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