1997 Toyota Corolla Engine doing coughts ( speed vehicle c

1997 TOYOTA COROLLA
205,890 MILES • 4 CYL • 2WD • AUTOMATIC
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GGVAZQ1
  • MEMBER
  • 1 POST
At the moment of reach the speed of 45 miles the car start coughing until get 55 miles still is doing the same.. but after 55 miles the car runs pretty good.
I had ready change ,Gas pump, spark plugs & wires, and the distributor,
In advance thanks for the advice.
Gerardo
Dec 28, 2009 at 5:14 PM
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RASMATAZ
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 75,992 POSTS
Your probable causes could be one of the following:

Oxygen Sensor
Catalytic Converter
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
Dec 28, 2009 at 5:50 PM