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1998 Chevy Lumina car bucks

Tiny
MOEMOE121
  • MEMBER
  • 1998 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 88,000 MILES
My car will buck in normal driving or highway driving, does not do it all the tine but a majority. I have change fuel filter, plugs and wires, crank sensor, tried another mass airflow sensor coil packs and module, clean throttle plate and iac motor and changed the tps. I you have any suggestions on what it could be I would highly appreciate it, Thank You.
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Friday, July 17th, 2009 AT 8:00 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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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Friday, July 17th, 2009 AT 8:15 PM

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