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1998 Chevy Malibu hesitation on the highway

Tiny
JPWILLIAMS0
  • MEMBER
  • 1998 CHEVROLET MALIBU
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 102,500 MILES
Hesitation on the highway in my 1998 chevy malibu. Changed air filter, map sensor and 02 sensor (before the cat). Also tried fuel injector cleaner still have same problem. Any suggestions next?
Tuesday, April 13th, 2010 AT 12:51 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lack of acceleration, chugging, hesitating, bogging etc. Could be caused by one of the following below.

Inspect and test all the following listed below and get back with some results

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard.
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Tuesday, April 13th, 2010 AT 1:50 PM

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