1991 Mitsubishi Mirage

1991 MITSUBISHI MIRAGE
18,900 MILES • 4 CYL • FWD • AUTOMATIC
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THE-ORD
  • MEMBER
  • 1 POST
car started to shake sorta rpms would suddenly slip/drop sometimes when over 45/55 mph or 2500ish rpm.. but the last couple nights after driving around town, suddenly it started to happen constantly, like it wasnt staying in gear or as if something is slipping. but both times in the morning it drives fine...
Jan 16, 2010 at 8:15 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Oxygen sensor
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
Cap and Rotor
Jan 16, 2010 at 7:27 PM
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